21131692 has 6 divisors (see below), whose sum is σ = 36980468. Its totient is φ = 10565844.

The previous prime is 21131689. The next prime is 21131701. The reversal of 21131692 is 29613112.

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 as a sum of consecutive naturals, namely, 2641458 + ... + 2641465.

Almost surely, 2^21131692 is an apocalyptic number.

It is an amenable number.

21131692 is a deficient number, since it is larger than the sum of its proper divisors (15848776).

21131692 is a wasteful number, since it uses less digits than its factorization.

21131692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282927 (or 5282925 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

The square root of 21131692 is about 4596.9220136957. The cubic root of 21131692 is about 276.4679277884.

The spelling of 21131692 in words is "twenty-one million, one hundred thirty-one thousand, six hundred ninety-two".