21979461982 has 8 divisors (see below), whose sum is σ = 33035265000. Its totient is φ = 10967706984.

The previous prime is 21979461979. The next prime is 21979462079. The reversal of 21979461982 is 28916497912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11010757 + ... + 11012752.

It is an arithmetic number, because the mean of its divisors is an integer number (4129408125).

Almost surely, 2^21979461982 is an apocalyptic number.

21979461982 is a deficient number, since it is larger than the sum of its proper divisors (11055803018).

21979461982 is a wasteful number, since it uses less digits than its factorization.

21979461982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22024010.

The product of its digits is 3919104, while the sum is 58.

The spelling of 21979461982 in words is "twenty-one billion, nine hundred seventy-nine million, four hundred sixty-one thousand, nine hundred eighty-two".