213557933 has 4 divisors (see below), whose sum is σ = 213809148. Its totient is φ = 213306720.

The previous prime is 213557917. The next prime is 213557951. The reversal of 213557933 is 339755312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124500964 + 89056969 = 11158^2 + 9437^2 .

It is a cyclic number.

It is not a de Polignac number, because 213557933 - 2⁴ = 213557917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213557963) 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, 124328 + ... + 126033.

It is an arithmetic number, because the mean of its divisors is an integer number (53452287).

Almost surely, 2^213557933 is an apocalyptic number.

It is an amenable number.

213557933 is a deficient number, since it is larger than the sum of its proper divisors (251215).

213557933 is an equidigital number, since it uses as much as digits as its factorization.

213557933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251214.

The product of its digits is 85050, while the sum is 38.

The square root of 213557933 is about 14613.6214881870. The cubic root of 213557933 is about 597.7302514145.

The spelling of 213557933 in words is "two hundred thirteen million, five hundred fifty-seven thousand, nine hundred thirty-three".