21923298 has 20 divisors (see below), whose sum is σ = 49124790. Its totient is φ = 7307712.

The previous prime is 21923273. The next prime is 21923299. The reversal of 21923298 is 89232912.

It can be written as a sum of positive squares in only one way, i.e., 19210689 + 2712609 = 4383^2 + 1647^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21923299) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 67503 + ... + 67826.

Almost surely, 2^21923298 is an apocalyptic number.

21923298 is an abundant number, since it is smaller than the sum of its proper divisors (27201492).

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

21923298 is a wasteful number, since it uses less digits than its factorization.

21923298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135343 (or 135334 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21923298 is about 4682.2321599852. The cubic root of 21923298 is about 279.8779144631.

The spelling of 21923298 in words is "twenty-one million, nine hundred twenty-three thousand, two hundred ninety-eight".