213121233 has 32 divisors (see below), whose sum is σ = 357929600. Its totient is φ = 124244928.

The previous prime is 213121229. The next prime is 213121241. The reversal of 213121233 is 332121312.

It is not a de Polignac number, because 213121233 - 2² = 213121229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213121213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9310 + ... + 22647.

It is an arithmetic number, because the mean of its divisors is an integer number (11185300).

Almost surely, 2^213121233 is an apocalyptic number.

It is an amenable number.

213121233 is a deficient number, since it is larger than the sum of its proper divisors (144808367).

213121233 is a wasteful number, since it uses less digits than its factorization.

213121233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31998 (or 31992 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 213121233 is about 14598.6723026445. The cubic root of 213121233 is about 597.3225448286.

Adding to 213121233 its reverse (332121312), we get a palindrome (545242545).

The spelling of 213121233 in words is "two hundred thirteen million, one hundred twenty-one thousand, two hundred thirty-three".