21351115332 has 18 divisors (see below), whose sum is σ = 53970874958. Its totient is φ = 7117038432.

The previous prime is 21351115319. The next prime is 21351115391. The reversal of 21351115332 is 23351115312.

21351115332 is a `hidden beast` number, since 2 + 13 + 5 + 111 + 533 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16852193856 + 4498921476 = 129816^2 + 67074^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 21351115296 and 21351115305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 296543233 + ... + 296543304.

Almost surely, 2^21351115332 is an apocalyptic number.

It is an amenable number.

21351115332 is an abundant number, since it is smaller than the sum of its proper divisors (32619759626).

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

21351115332 is a wasteful number, since it uses less digits than its factorization.

21351115332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593086547 (or 593086542 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The spelling of 21351115332 in words is "twenty-one billion, three hundred fifty-one million, one hundred fifteen thousand, three hundred thirty-two".