213231136 has 36 divisors (see below), whose sum is σ = 445964778. Its totient is φ = 100339712.

The previous prime is 213231131. The next prime is 213231157. The reversal of 213231136 is 631132312.

It can be written as a sum of positive squares in 3 ways, for example, as 205635600 + 7595536 = 14340^2 + 2756^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213231131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2281 + ... + 20776.

Almost surely, 2^213231136 is an apocalyptic number.

It is an amenable number.

213231136 is an abundant number, since it is smaller than the sum of its proper divisors (232733642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213231136 is a wasteful number, since it uses less digits than its factorization.

213231136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23101 (or 23076 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The square root of 213231136 is about 14602.4359611676. The cubic root of 213231136 is about 597.4252035478.

Adding to 213231136 its reverse (631132312), we get a palindrome (844363448).

The spelling of 213231136 in words is "two hundred thirteen million, two hundred thirty-one thousand, one hundred thirty-six".