223992921 has 4 divisors (see below), whose sum is σ = 298657232. Its totient is φ = 149328612.

The previous prime is 223992911. The next prime is 223992943. The reversal of 223992921 is 129299322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 223992921 - 2¹⁷ = 223861849 is a prime.

It is a super-2 number, since 2×223992921² = 100345657316224482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223992921.

It is not an unprimeable number, because it can be changed into a prime (223992911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37332151 + ... + 37332156.

It is an arithmetic number, because the mean of its divisors is an integer number (74664308).

Almost surely, 2^223992921 is an apocalyptic number.

It is an amenable number.

223992921 is a deficient number, since it is larger than the sum of its proper divisors (74664311).

223992921 is an equidigital number, since it uses as much as digits as its factorization.

223992921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74664310.

The product of its digits is 34992, while the sum is 39.

The square root of 223992921 is about 14966.3930524358. The cubic root of 223992921 is about 607.3113966847.

The spelling of 223992921 in words is "two hundred twenty-three million, nine hundred ninety-two thousand, nine hundred twenty-one".