21792994 has 4 divisors (see below), whose sum is σ = 32689494. Its totient is φ = 10896496.

The previous prime is 21792989. The next prime is 21793021. The reversal of 21792994 is 49929712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 5349969 = 4055^2 + 2313^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21792994.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5448247 + ... + 5448250.

Almost surely, 2^21792994 is an apocalyptic number.

21792994 is a deficient number, since it is larger than the sum of its proper divisors (10896500).

21792994 is a wasteful number, since it uses less digits than its factorization.

21792994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10896499.

The product of its digits is 81648, while the sum is 43.

The square root of 21792994 is about 4668.2966915139. The cubic root of 21792994 is about 279.3223152024.

The spelling of 21792994 in words is "twenty-one million, seven hundred ninety-two thousand, nine hundred ninety-four".