213235013 has 4 divisors (see below), whose sum is σ = 213756780. Its totient is φ = 212713248.

The previous prime is 213235007. The next prime is 213235021. The reversal of 213235013 is 310532312.

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 161366209 + 51868804 = 12703^2 + 7202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213235013 is a prime.

It is a super-2 number, since 2×213235013² = 90938341538220338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213235073) 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, 260270 + ... + 261087.

It is an arithmetic number, because the mean of its divisors is an integer number (53439195).

Almost surely, 2^213235013 is an apocalyptic number.

It is an amenable number.

213235013 is a deficient number, since it is larger than the sum of its proper divisors (521767).

213235013 is an equidigital number, since it uses as much as digits as its factorization.

213235013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521766.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 213235013 is about 14602.5687123876. The cubic root of 213235013 is about 597.4288243503.

Adding to 213235013 its reverse (310532312), we get a palindrome (523767325).

The spelling of 213235013 in words is "two hundred thirteen million, two hundred thirty-five thousand, thirteen".