21620590772 has 48 divisors (see below), whose sum is σ = 43005634560. Its totient is φ = 9421576800.

The previous prime is 21620590759. The next prime is 21620590781. The reversal of 21620590772 is 27709502612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71879 + ... + 220017.

It is an arithmetic number, because the mean of its divisors is an integer number (895950720).

Almost surely, 2^21620590772 is an apocalyptic number.

21620590772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21620590772 is a deficient number, since it is larger than the sum of its proper divisors (21385043788).

21620590772 is a wasteful number, since it uses less digits than its factorization.

21620590772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148292 (or 148290 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 21620590772 in words is "twenty-one billion, six hundred twenty million, five hundred ninety thousand, seven hundred seventy-two".