21020838976 has 14 divisors (see below), whose sum is σ = 41713227470. Its totient is φ = 10510419456.

The previous prime is 21020838967. The next prime is 21020838977. The reversal of 21020838976 is 67983802012.

It can be written as a sum of positive squares in only one way, i.e., 20057357376 + 963481600 = 141624^2 + 31040^2 .

It is a super-3 number, since 3×21020838976³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020838977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164225241 + ... + 164225368.

Almost surely, 2^21020838976 is an apocalyptic number.

It is an amenable number.

21020838976 is a deficient number, since it is larger than the sum of its proper divisors (20692388494).

21020838976 is an equidigital number, since it uses as much as digits as its factorization.

21020838976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328450621 (or 328450611 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 21020838976 in words is "twenty-one billion, twenty million, eight hundred thirty-eight thousand, nine hundred seventy-six".