21315540332 has 12 divisors (see below), whose sum is σ = 37489645200. Its totient is φ = 10604213136.

The previous prime is 21315540313. The next prime is 21315540359. The reversal of 21315540332 is 23304551312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21315540295 and 21315540304.

It is an unprimeable number.

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, 13388363 + ... + 13389954.

It is an arithmetic number, because the mean of its divisors is an integer number (3124137100).

Almost surely, 2^21315540332 is an apocalyptic number.

It is an amenable number.

21315540332 is a deficient number, since it is larger than the sum of its proper divisors (16174104868).

21315540332 is a wasteful number, since it uses less digits than its factorization.

21315540332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26778520 (or 26778518 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 21315540332 in words is "twenty-one billion, three hundred fifteen million, five hundred forty thousand, three hundred thirty-two".