21572322460 has 24 divisors (see below), whose sum is σ = 48786637536. Its totient is φ = 7965165120.

The previous prime is 21572322437. The next prime is 21572322461. The reversal of 21572322460 is 6422327512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21572322461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41484976 + ... + 41485495.

It is an arithmetic number, because the mean of its divisors is an integer number (2032776564).

Almost surely, 2^21572322460 is an apocalyptic number.

21572322460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21572322460 is an abundant number, since it is smaller than the sum of its proper divisors (27214315076).

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

21572322460 is a wasteful number, since it uses less digits than its factorization.

21572322460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82970493 (or 82970491 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

Adding to 21572322460 its reverse (6422327512), we get a palindrome (27994649972).

The spelling of 21572322460 in words is "twenty-one billion, five hundred seventy-two million, three hundred twenty-two thousand, four hundred sixty".