21992692 has 24 divisors (see below), whose sum is σ = 40352256. Its totient is φ = 10468128.

The previous prime is 21992657. The next prime is 21992693. The reversal of 21992692 is 29629912.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21992693) 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, 25053 + ... + 25915.

It is an arithmetic number, because the mean of its divisors is an integer number (1681344).

Almost surely, 2^21992692 is an apocalyptic number.

It is an amenable number.

21992692 is a deficient number, since it is larger than the sum of its proper divisors (18359564).

21992692 is a wasteful number, since it uses less digits than its factorization.

21992692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167 (or 1165 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 21992692 is about 4689.6366596998. The cubic root of 21992692 is about 280.1729034121.

The spelling of 21992692 in words is "twenty-one million, nine hundred ninety-two thousand, six hundred ninety-two".