213235457 has 4 divisors (see below), whose sum is σ = 215934720. Its totient is φ = 210536196.

The previous prime is 213235447. The next prime is 213235481. The reversal of 213235457 is 754532312.

213235457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213235457 - 2¹⁴ = 213219073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213235417) 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, 1349513 + ... + 1349670.

It is an arithmetic number, because the mean of its divisors is an integer number (53983680).

Almost surely, 2^213235457 is an apocalyptic number.

It is an amenable number.

213235457 is a deficient number, since it is larger than the sum of its proper divisors (2699263).

213235457 is an equidigital number, since it uses as much as digits as its factorization.

213235457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699262.

The product of its digits is 25200, while the sum is 32.

The square root of 213235457 is about 14602.5839151843. The cubic root of 213235457 is about 597.4292390073.

Adding to 213235457 its reverse (754532312), we get a palindrome (967767769).

The spelling of 213235457 in words is "two hundred thirteen million, two hundred thirty-five thousand, four hundred fifty-seven".