21190590976 has 20 divisors (see below), whose sum is σ = 42339795102. Its totient is φ = 10595295232.

The previous prime is 21190590961. The next prime is 21190590977. The reversal of 21190590976 is 67909509112.

It can be written as a sum of positive squares in only one way, i.e., 15916345600 + 5274245376 = 126160^2 + 72624^2 .

It is a super-2 number, since 2×21190590976² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21190590977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20693425 + ... + 20694448.

Almost surely, 2^21190590976 is an apocalyptic number.

It is an amenable number.

21190590976 is a deficient number, since it is larger than the sum of its proper divisors (21149204126).

21190590976 is an frugal number, since it uses more digits than its factorization.

21190590976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41387891 (or 41387875 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 49.

The spelling of 21190590976 in words is "twenty-one billion, one hundred ninety million, five hundred ninety thousand, nine hundred seventy-six".