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21043212115 = 54208642423
BaseRepresentation
bin10011100110010001…
…011110111101010011
32000022112111221020111
4103212101132331103
5321044030241430
613400033022151
71343320231432
oct234621367523
960275457214
1021043212115
118a193877a2
1240b33b4957
131ca4864703
141038a81119
15832635c2a
hex4e645ef53

21043212115 has 4 divisors (see below), whose sum is σ = 25251854544. Its totient is φ = 16834569688.

The previous prime is 21043212109. The next prime is 21043212137. The reversal of 21043212115 is 51121234012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21043212115 is a prime.

It is a super-2 number, since 2×210432121152 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104321207 + ... + 2104321216.

It is an arithmetic number, because the mean of its divisors is an integer number (6312963636).

Almost surely, 221043212115 is an apocalyptic number.

21043212115 is a deficient number, since it is larger than the sum of its proper divisors (4208642429).

21043212115 is an equidigital number, since it uses as much as digits as its factorization.

21043212115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208642428.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21043212115 its reverse (51121234012), we get a palindrome (72164446127).

The spelling of 21043212115 in words is "twenty-one billion, forty-three million, two hundred twelve thousand, one hundred fifteen".

Divisors: 1 5 4208642423 21043212115