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21213002431 = 311931354371
BaseRepresentation
bin10011110000011001…
…001011101010111111
32000202101000011202201
4103300121023222333
5321421012034211
613424540132331
71350451355065
oct236031135277
960671004681
1021213002431
118aa6206775
1241402370a7
132000aa245a
14105343c035
158424c40c1
hex4f064babf

21213002431 has 8 divisors (see below), whose sum is σ = 21908694528. Its totient is φ = 20518023000.

The previous prime is 21213002417. The next prime is 21213002453. The reversal of 21213002431 is 13420031212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213002431 - 29 = 21213001919 is a prime.

It is a super-2 number, since 2×212130024312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213002399 and 21213002408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213002471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117325 + ... + 237046.

It is an arithmetic number, because the mean of its divisors is an integer number (2738586816).

Almost surely, 221213002431 is an apocalyptic number.

21213002431 is a deficient number, since it is larger than the sum of its proper divisors (695692097).

21213002431 is a wasteful number, since it uses less digits than its factorization.

21213002431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356333.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21213002431 its reverse (13420031212), we get a palindrome (34633033643).

The spelling of 21213002431 in words is "twenty-one billion, two hundred thirteen million, two thousand, four hundred thirty-one".

Divisors: 1 31 1931 59861 354371 10985501 684290401 21213002431