21986523764 has 48 divisors (see below), whose sum is σ = 39825434880. Its totient is φ = 10612840320.

The previous prime is 21986523751. The next prime is 21986523803. The reversal of 21986523764 is 46732568912.

It is a super-3 number, since 3×21986523764³ (a number of 32 digits) contains 333 as substring.

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, 11108927 + ... + 11110905.

It is an arithmetic number, because the mean of its divisors is an integer number (829696560).

Almost surely, 2^21986523764 is an apocalyptic number.

It is an amenable number.

21986523764 is a deficient number, since it is larger than the sum of its proper divisors (17838911116).

21986523764 is a wasteful number, since it uses less digits than its factorization.

21986523764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568 (or 2566 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 53.

The spelling of 21986523764 in words is "twenty-one billion, nine hundred eighty-six million, five hundred twenty-three thousand, seven hundred sixty-four".