21775521364 has 24 divisors (see below), whose sum is σ = 38663352000. Its totient is φ = 10729004160.

The previous prime is 21775521343. The next prime is 21775521371. The reversal of 21775521364 is 46312557712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21775521364.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577852 + ... + 614380.

It is an arithmetic number, because the mean of its divisors is an integer number (1610973000).

Almost surely, 2^21775521364 is an apocalyptic number.

It is an amenable number.

21775521364 is a deficient number, since it is larger than the sum of its proper divisors (16887830636).

21775521364 is a wasteful number, since it uses less digits than its factorization.

21775521364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38703 (or 38701 counting only the distinct ones).

The product of its digits is 352800, while the sum is 43.

The spelling of 21775521364 in words is "twenty-one billion, seven hundred seventy-five million, five hundred twenty-one thousand, three hundred sixty-four".