21917692 has 12 divisors (see below), whose sum is σ = 40612320. Its totient is φ = 10314176.

The previous prime is 21917683. The next prime is 21917699. The reversal of 21917692 is 29671912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21917699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161092 + ... + 161227.

It is an arithmetic number, because the mean of its divisors is an integer number (3384360).

Almost surely, 2^21917692 is an apocalyptic number.

It is an amenable number.

21917692 is a deficient number, since it is larger than the sum of its proper divisors (18694628).

21917692 is a wasteful number, since it uses less digits than its factorization.

21917692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322340 (or 322338 counting only the distinct ones).

The product of its digits is 13608, while the sum is 37.

The square root of 21917692 is about 4681.6334756151. The cubic root of 21917692 is about 279.8540565967.

The spelling of 21917692 in words is "twenty-one million, nine hundred seventeen thousand, six hundred ninety-two".