21862615768 has 48 divisors (see below), whose sum is σ = 47883112200. Its totient is φ = 9330773760.

The previous prime is 21862615631. The next prime is 21862615783. The reversal of 21862615768 is 86751626812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21238 + ... + 210181.

Almost surely, 2^21862615768 is an apocalyptic number.

21862615768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21862615768 is an abundant number, since it is smaller than the sum of its proper divisors (26020496432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21862615768 is a wasteful number, since it uses less digits than its factorization.

21862615768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231680 (or 231669 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 21862615768 in words is "twenty-one billion, eight hundred sixty-two million, six hundred fifteen thousand, seven hundred sixty-eight".