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21440476741631 = 121717617482943
BaseRepresentation
bin1001101111111111111111…
…11111111111111111111111
32210220200121200120211012112
410313333333333333333333
510302240044021213011
6113333341413524235
74342011000220013
oct467777777777777
983820550524175
1021440476741631
116916945194412
1224a338434367b
13bc6a9c9709ac
14541a20494543
15272ab179e58b
hex137fffffffff

21440476741631 has 4 divisors (see below), whose sum is σ = 21458094225792. Its totient is φ = 21422859257472.

The previous prime is 21440476741603. The next prime is 21440476741639. The reversal of 21440476741631 is 13614767404412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21440476741631 - 226 = 21440409632767 is a prime.

It is a super-2 number, since 2×214404767416312 (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 8 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21440476741631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440476741639) by changing a digit.

Being equal to 39×239-1, it is a Woodall number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8808740255 + ... + 8808742688.

It is an arithmetic number, because the mean of its divisors is an integer number (5364523556448).

Almost surely, 221440476741631 is an apocalyptic number.

21440476741631 is a deficient number, since it is larger than the sum of its proper divisors (17617484161).

21440476741631 is a wasteful number, since it uses less digits than its factorization.

21440476741631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17617484160.

The product of its (nonzero) digits is 2709504, while the sum is 50.

The spelling of 21440476741631 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred thirty-one".

Divisors: 1 1217 17617482943 21440476741631