228583912921 has 64 divisors (see below), whose sum is σ = 302536192000. Its totient is φ = 167667667200.

The previous prime is 228583912919. The next prime is 228583912943. The reversal of 228583912921 is 129219385822.

It is a 9-Lehmer number, since φ(228583912921) divides (228583912921-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 228583912921 - 2¹ = 228583912919 is a prime.

It is the 478105-th Hogben number.

It is not an unprimeable number, because it can be changed into a prime (228583912951) by changing a digit.

It is a nontrivial repunit in base 478104.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20982886 + ... + 20993776.

It is an arithmetic number, because the mean of its divisors is an integer number (4727128000).

Almost surely, 2^228583912921 is an apocalyptic number.

It is an amenable number.

228583912921 is a deficient number, since it is larger than the sum of its proper divisors (73952279079).

228583912921 is a wasteful number, since it uses less digits than its factorization.

228583912921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11190.

The product of its digits is 1244160, while the sum is 52.

The spelling of 228583912921 in words is "two hundred twenty-eight billion, five hundred eighty-three million, nine hundred twelve thousand, nine hundred twenty-one".