21402612350656 has 28 divisors (see below), whose sum is σ = 44317365794352. Its totient is φ = 10236031993088.

The previous prime is 21402612350653. The next prime is 21402612350671. The reversal of 21402612350656 is 65605321620412.

It is not an unprimeable number, because it can be changed into a prime (21402612350653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7269907615 + ... + 7269910558.

It is an arithmetic number, because the mean of its divisors is an integer number (1582763064084).

Almost surely, 2^{21402612350656} is an apocalyptic number.

It is an amenable number.

21402612350656 is an abundant number, since it is smaller than the sum of its proper divisors (22914753443696).

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

21402612350656 is a wasteful number, since it uses less digits than its factorization.

21402612350656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14539818208 (or 14539818198 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 21402612350656 in words is "twenty-one trillion, four hundred two billion, six hundred twelve million, three hundred fifty thousand, six hundred fifty-six".