23221998 has 32 divisors (see below), whose sum is σ = 51772320. Its totient is φ = 7715520.

The previous prime is 23221997. The next prime is 23222033. The reversal of 23221998 is 89912232.

It is a super-2 number, since 2×23221998² = 1078522382224008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23221993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24208 + ... + 25148.

It is an arithmetic number, because the mean of its divisors is an integer number (1617885).

Almost surely, 2^23221998 is an apocalyptic number.

23221998 is an abundant number, since it is smaller than the sum of its proper divisors (28550322).

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

23221998 is a wasteful number, since it uses less digits than its factorization.

23221998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409 (or 1403 counting only the distinct ones).

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

The square root of 23221998 is about 4818.9208335477. The cubic root of 23221998 is about 285.2987449096.

The spelling of 23221998 in words is "twenty-three million, two hundred twenty-one thousand, nine hundred ninety-eight".