213031233 has 12 divisors (see below), whose sum is σ = 325812708. Its totient is φ = 133666560.

The previous prime is 213031223. The next prime is 213031271. The reversal of 213031233 is 332130312.

It can be written as a sum of positive squares in 2 ways, for example, as 154554624 + 58476609 = 12432^2 + 7647^2 .

It is not a de Polignac number, because 213031233 - 2¹² = 213027137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213031223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 696028 + ... + 696333.

It is an arithmetic number, because the mean of its divisors is an integer number (27151059).

Almost surely, 2^213031233 is an apocalyptic number.

It is an amenable number.

213031233 is a deficient number, since it is larger than the sum of its proper divisors (112781475).

213031233 is a wasteful number, since it uses less digits than its factorization.

213031233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392384 (or 1392381 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 213031233 is about 14595.5895050525. The cubic root of 213031233 is about 597.2384509110.

Adding to 213031233 its reverse (332130312), we get a palindrome (545161545).

The spelling of 213031233 in words is "two hundred thirteen million, thirty-one thousand, two hundred thirty-three".