21670692 has 24 divisors (see below), whose sum is σ = 52764096. Its totient is φ = 6909408.

The previous prime is 21670679. The next prime is 21670703. The reversal of 21670692 is 29607612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38983 + ... + 39534.

It is an arithmetic number, because the mean of its divisors is an integer number (2198504).

Almost surely, 2^21670692 is an apocalyptic number.

It is an amenable number.

21670692 is an abundant number, since it is smaller than the sum of its proper divisors (31093404).

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

21670692 is a wasteful number, since it uses less digits than its factorization.

21670692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78547 (or 78545 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21670692 is about 4655.1790513363. The cubic root of 21670692 is about 278.7988169512.

The spelling of 21670692 in words is "twenty-one million, six hundred seventy thousand, six hundred ninety-two".