21445354564 has 12 divisors (see below), whose sum is σ = 37650045888. Its totient is φ = 10688198600.

The previous prime is 21445354523. The next prime is 21445354591. The reversal of 21445354564 is 46545354412.

It is a self number, because there is not a number n which added to its sum of digits gives 21445354564.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8618272 + ... + 8620759.

It is an arithmetic number, because the mean of its divisors is an integer number (3137503824).

Almost surely, 2^21445354564 is an apocalyptic number.

It is an amenable number.

21445354564 is a deficient number, since it is larger than the sum of its proper divisors (16204691324).

21445354564 is a wasteful number, since it uses less digits than its factorization.

21445354564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17239346 (or 17239344 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 43.

The spelling of 21445354564 in words is "twenty-one billion, four hundred forty-five million, three hundred fifty-four thousand, five hundred sixty-four".