21375065976 has 64 divisors (see below), whose sum is σ = 58320000000. Its totient is φ = 6474585600.

The previous prime is 21375065953. The next prime is 21375065977. The reversal of 21375065976 is 67956057312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375065977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 668400 + ... + 699648.

It is an arithmetic number, because the mean of its divisors is an integer number (911250000).

Almost surely, 2^21375065976 is an apocalyptic number.

It is an amenable number.

21375065976 is an abundant number, since it is smaller than the sum of its proper divisors (36944934024).

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

21375065976 is a wasteful number, since it uses less digits than its factorization.

21375065976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33860 (or 33856 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 51.

The spelling of 21375065976 in words is "twenty-one billion, three hundred seventy-five million, sixty-five thousand, nine hundred seventy-six".