229868921 has 4 divisors (see below), whose sum is σ = 229901952. Its totient is φ = 229835892.

The previous prime is 229868879. The next prime is 229868929. The reversal of 229868921 is 129868922.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229868921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (229868929) 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, 1565 + ... + 21498.

It is an arithmetic number, because the mean of its divisors is an integer number (57475488).

Almost surely, 2^229868921 is an apocalyptic number.

It is an amenable number.

229868921 is a deficient number, since it is larger than the sum of its proper divisors (33031).

229868921 is an equidigital number, since it uses as much as digits as its factorization.

229868921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33030.

The product of its digits is 248832, while the sum is 47.

The square root of 229868921 is about 15161.4287255522. The cubic root of 229868921 is about 612.5761524641.

Subtracting from 229868921 its reverse (129868922), we obtain a palindrome (99999999).

The spelling of 229868921 in words is "two hundred twenty-nine million, eight hundred sixty-eight thousand, nine hundred twenty-one".