21723642982 has 16 divisors (see below), whose sum is σ = 33470678160. Its totient is φ = 10566829728.

The previous prime is 21723642979. The next prime is 21723643003. The reversal of 21723642982 is 28924632712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712413 + ... + 742279.

It is an arithmetic number, because the mean of its divisors is an integer number (2091917385).

Almost surely, 2^21723642982 is an apocalyptic number.

21723642982 is a deficient number, since it is larger than the sum of its proper divisors (11747035178).

21723642982 is a wasteful number, since it uses less digits than its factorization.

21723642982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39735.

The product of its digits is 580608, while the sum is 46.

The spelling of 21723642982 in words is "twenty-one billion, seven hundred twenty-three million, six hundred forty-two thousand, nine hundred eighty-two".