21513882982 has 4 divisors (see below), whose sum is σ = 32270824476. Its totient is φ = 10756941490.

The previous prime is 21513882961. The next prime is 21513882997. The reversal of 21513882982 is 28928831512.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378470744 + ... + 5378470747.

It is an arithmetic number, because the mean of its divisors is an integer number (8067706119).

Almost surely, 2^21513882982 is an apocalyptic number.

21513882982 is a deficient number, since it is larger than the sum of its proper divisors (10756941494).

21513882982 is a wasteful number, since it uses less digits than its factorization.

21513882982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10756941493.

The product of its digits is 552960, while the sum is 49.

The spelling of 21513882982 in words is "twenty-one billion, five hundred thirteen million, eight hundred eighty-two thousand, nine hundred eighty-two".