213013231 has 4 divisors (see below), whose sum is σ = 214443000. Its totient is φ = 211583464.

The previous prime is 213013219. The next prime is 213013243. The reversal of 213013231 is 132310312.

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

It is an interprime number because it is at equal distance from previous prime (213013219) and next prime (213013243).

It is a cyclic number.

It is not a de Polignac number, because 213013231 - 2⁷ = 213013103 is a prime.

It is a super-2 number, since 2×213013231² = 90749273162118722, 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 (213013211) 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, 714661 + ... + 714958.

It is an arithmetic number, because the mean of its divisors is an integer number (53610750).

Almost surely, 2^213013231 is an apocalyptic number.

213013231 is a deficient number, since it is larger than the sum of its proper divisors (1429769).

213013231 is a wasteful number, since it uses less digits than its factorization.

213013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429768.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 213013231 is about 14594.9727988784. The cubic root of 213013231 is about 597.2216274163.

Adding to 213013231 its reverse (132310312), we get a palindrome (345323543).

The spelling of 213013231 in words is "two hundred thirteen million, thirteen thousand, two hundred thirty-one".