21315028714 has 12 divisors (see below), whose sum is σ = 37192550274. Its totient is φ = 9135012264.

The previous prime is 21315028711. The next prime is 21315028759. The reversal of 21315028714 is 41782051312.

It can be written as a sum of positive squares in only one way, i.e., 21160648089 + 154380625 = 145467^2 + 12425^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21315028714.

It is not an unprimeable number, because it can be changed into a prime (21315028711) 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, 108750049 + ... + 108750244.

Almost surely, 2^21315028714 is an apocalyptic number.

21315028714 is a deficient number, since it is larger than the sum of its proper divisors (15877521560).

21315028714 is a wasteful number, since it uses less digits than its factorization.

21315028714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217500309 (or 217500302 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 21315028714 in words is "twenty-one billion, three hundred fifteen million, twenty-eight thousand, seven hundred fourteen".