21492944590 has 64 divisors (see below), whose sum is σ = 43887997440. Its totient is φ = 7512704640.

The previous prime is 21492944567. The next prime is 21492944591. The reversal of 21492944590 is 9544929412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21492944591) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4965007 + ... + 4969333.

It is an arithmetic number, because the mean of its divisors is an integer number (685749960).

Almost surely, 2^21492944590 is an apocalyptic number.

21492944590 is an abundant number, since it is smaller than the sum of its proper divisors (22395052850).

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

21492944590 is a wasteful number, since it uses less digits than its factorization.

21492944590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6377.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 21492944590 in words is "twenty-one billion, four hundred ninety-two million, nine hundred forty-four thousand, five hundred ninety".