21196686 has 16 divisors (see below), whose sum is σ = 48449664. Its totient is φ = 6056184.

The previous prime is 21196657. The next prime is 21196687. The reversal of 21196686 is 68669112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21196687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252300 + ... + 252383.

It is an arithmetic number, because the mean of its divisors is an integer number (3028104).

Almost surely, 2^21196686 is an apocalyptic number.

21196686 is an abundant number, since it is smaller than the sum of its proper divisors (27252978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21196686 is a wasteful number, since it uses less digits than its factorization.

21196686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504695.

The product of its digits is 31104, while the sum is 39.

The square root of 21196686 is about 4603.9858818202. The cubic root of 21196686 is about 276.7510785801.

The spelling of 21196686 in words is "twenty-one million, one hundred ninety-six thousand, six hundred eighty-six".