21113417564 has 48 divisors (see below), whose sum is σ = 38080385280. Its totient is φ = 10236695040.

The previous prime is 21113417537. The next prime is 21113417581. The reversal of 21113417564 is 46571431112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31186394 + ... + 31187070.

It is an arithmetic number, because the mean of its divisors is an integer number (793341360).

Almost surely, 2^21113417564 is an apocalyptic number.

It is an amenable number.

21113417564 is a deficient number, since it is larger than the sum of its proper divisors (16966967716).

21113417564 is a wasteful number, since it uses less digits than its factorization.

21113417564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598 (or 1596 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

Adding to 21113417564 its reverse (46571431112), we get a palindrome (67684848676).

The spelling of 21113417564 in words is "twenty-one billion, one hundred thirteen million, four hundred seventeen thousand, five hundred sixty-four".