21364395976 has 96 divisors (see below), whose sum is σ = 50377803840. Its totient is φ = 8314416000.

The previous prime is 21364395947. The next prime is 21364396003. The reversal of 21364395976 is 67959346312.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11796111 + ... + 11797921.

It is an arithmetic number, because the mean of its divisors is an integer number (524768790).

Almost surely, 2^21364395976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21364395976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25188901920).

21364395976 is an abundant number, since it is smaller than the sum of its proper divisors (29013407864).

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

21364395976 is a wasteful number, since it uses less digits than its factorization.

21364395976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587 (or 3572 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 55.

The spelling of 21364395976 in words is "twenty-one billion, three hundred sixty-four million, three hundred ninety-five thousand, nine hundred seventy-six".