21255510032 has 10 divisors (see below), whose sum is σ = 41182550718. Its totient is φ = 10627755008.

The previous prime is 21255510019. The next prime is 21255510047. The reversal of 21255510032 is 23001555212.

It can be written as a sum of positive squares in only one way, i.e., 11358443776 + 9897066256 = 106576^2 + 99484^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21255509983 and 21255510010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664234673 + ... + 664234704.

Almost surely, 2^21255510032 is an apocalyptic number.

It is an amenable number.

21255510032 is a deficient number, since it is larger than the sum of its proper divisors (19927040686).

21255510032 is a wasteful number, since it uses less digits than its factorization.

21255510032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328469385 (or 1328469379 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21255510032 in words is "twenty-one billion, two hundred fifty-five million, five hundred ten thousand, thirty-two".