21031452560 has 20 divisors (see below), whose sum is σ = 48898127388. Its totient is φ = 8412580992.

The previous prime is 21031452551. The next prime is 21031452581. The reversal of 21031452560 is 6525413012.

It can be written as a sum of positive squares in 2 ways, for example, as 2850705664 + 18180746896 = 53392^2 + 134836^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131446499 + ... + 131446658.

Almost surely, 2^21031452560 is an apocalyptic number.

21031452560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031452560 is an abundant number, since it is smaller than the sum of its proper divisors (27866674828).

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

21031452560 is a wasteful number, since it uses less digits than its factorization.

21031452560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262893170 (or 262893164 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21031452560 its reverse (6525413012), we get a palindrome (27556865572).

The spelling of 21031452560 in words is "twenty-one billion, thirty-one million, four hundred fifty-two thousand, five hundred sixty".