21356925016 has 16 divisors (see below), whose sum is σ = 45764839440. Its totient is φ = 9152967840.

The previous prime is 21356925013. The next prime is 21356925043. The reversal of 21356925016 is 61052965312.

It is a super-2 number, since 2×21356925016² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21356925016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356925013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190686775 + ... + 190686886.

It is an arithmetic number, because the mean of its divisors is an integer number (2860302465).

Almost surely, 2^21356925016 is an apocalyptic number.

It is an amenable number.

21356925016 is an abundant number, since it is smaller than the sum of its proper divisors (24407914424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21356925016 is a wasteful number, since it uses less digits than its factorization.

21356925016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381373674 (or 381373670 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 21356925016 in words is "twenty-one billion, three hundred fifty-six million, nine hundred twenty-five thousand, sixteen".