21992073 has 8 divisors (see below), whose sum is σ = 29820000. Its totient is φ = 14412768.

The previous prime is 21992041. The next prime is 21992077. The reversal of 21992073 is 37029912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21992073 - 2⁵ = 21992041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21992077) 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, 61948 + ... + 62301.

It is an arithmetic number, because the mean of its divisors is an integer number (3727500).

Almost surely, 2^21992073 is an apocalyptic number.

It is an amenable number.

21992073 is a deficient number, since it is larger than the sum of its proper divisors (7827927).

21992073 is a wasteful number, since it uses less digits than its factorization.

21992073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124311.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 21992073 is about 4689.5706626513. The cubic root of 21992073 is about 280.1702748321.

The spelling of 21992073 in words is "twenty-one million, nine hundred ninety-two thousand, seventy-three".