21122986 has 8 divisors (see below), whose sum is σ = 31754304. Its totient is φ = 10538220.

The previous prime is 21122971. The next prime is 21123013. The reversal of 21122986 is 68922112.

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

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, 10480 + ... + 12331.

It is an arithmetic number, because the mean of its divisors is an integer number (3969288).

Almost surely, 2^21122986 is an apocalyptic number.

21122986 is a deficient number, since it is larger than the sum of its proper divisors (10631318).

21122986 is a wasteful number, since it uses less digits than its factorization.

21122986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23276.

The product of its digits is 3456, while the sum is 31.

The square root of 21122986 is about 4595.9749781738. The cubic root of 21122986 is about 276.4299554324.

The spelling of 21122986 in words is "twenty-one million, one hundred twenty-two thousand, nine hundred eighty-six".