21115321466256 has 30 divisors (see below), whose sum is σ = 59093573270550. Its totient is φ = 7038440488704.

The previous prime is 21115321466249. The next prime is 21115321466257. The reversal of 21115321466256 is 65266412351112.

21115321466256 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 5 + 3 + 2 + 14 + 6 + 625 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20350781081856 + 764540384400 = 4511184^2 + 874380^2 .

It is not an unprimeable number, because it can be changed into a prime (21115321466257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73317088281 + ... + 73317088568.

It is an arithmetic number, because the mean of its divisors is an integer number (1969785775685).

Almost surely, 2^{21115321466256} is an apocalyptic number.

It is an amenable number.

21115321466256 is an abundant number, since it is smaller than the sum of its proper divisors (37978251804294).

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

21115321466256 is a wasteful number, since it uses less digits than its factorization.

21115321466256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146634176863 (or 146634176854 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 21115321466256 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-one million, four hundred sixty-six thousand, two hundred fifty-six".