21316692 has 24 divisors (see below), whose sum is σ = 49922656. Its totient is φ = 7079328.

The previous prime is 21316667. The next prime is 21316693. The reversal of 21316692 is 29661312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21316693) 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, 258 + ... + 6534.

Almost surely, 2^21316692 is an apocalyptic number.

It is an amenable number.

21316692 is an abundant number, since it is smaller than the sum of its proper divisors (28605964).

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

21316692 is a wasteful number, since it uses less digits than its factorization.

21316692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6567 (or 6565 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 21316692 is about 4617.0003248863. Note that the first 3 decimals coincide. The cubic root of 21316692 is about 277.2723756301.

The spelling of 21316692 in words is "twenty-one million, three hundred sixteen thousand, six hundred ninety-two".