213972233 has 2 divisors, whose sum is σ = 213972234. Its totient is φ = 213972232.

The previous prime is 213972193. The next prime is 213972259. The reversal of 213972233 is 332279312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213949129 + 23104 = 14627^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 213972233 - 2⁶ = 213972169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213972233.

It is not a weakly prime, because it can be changed into another prime (213972263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106986116 + 106986117.

It is an arithmetic number, because the mean of its divisors is an integer number (106986117).

Almost surely, 2^213972233 is an apocalyptic number.

It is an amenable number.

213972233 is a deficient number, since it is larger than the sum of its proper divisors (1).

213972233 is an equidigital number, since it uses as much as digits as its factorization.

213972233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 213972233 is about 14627.7897510184. The cubic root of 213972233 is about 598.1165317283.

The spelling of 213972233 in words is "two hundred thirteen million, nine hundred seventy-two thousand, two hundred thirty-three".