21986926958 has 16 divisors (see below), whose sum is σ = 36225601920. Its totient is φ = 9962039736.

The previous prime is 21986926937. The next prime is 21986926967. The reversal of 21986926958 is 85962968912.

It is a junction number, because it is equal to n+sod(n) for n = 21986926894 and 21986926903.

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, 12577460 + ... + 12579207.

It is an arithmetic number, because the mean of its divisors is an integer number (2264100120).

Almost surely, 2^21986926958 is an apocalyptic number.

21986926958 is a deficient number, since it is larger than the sum of its proper divisors (14238674962).

21986926958 is a wasteful number, since it uses less digits than its factorization.

21986926958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25156711.

The product of its digits is 33592320, while the sum is 65.

The spelling of 21986926958 in words is "twenty-one billion, nine hundred eighty-six million, nine hundred twenty-six thousand, nine hundred fifty-eight".