213115136 has 36 divisors (see below), whose sum is σ = 458127852. Its totient is φ = 98359296.

The previous prime is 213115121. The next prime is 213115157. The reversal of 213115136 is 631511312.

It can be written as a sum of positive squares in 2 ways, for example, as 14868736 + 198246400 = 3856^2 + 14080^2 .

It is a super-2 number, since 2×213115136² = 90836122384596992, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28691 + ... + 35346.

Almost surely, 2^213115136 is an apocalyptic number.

213115136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

213115136 is an abundant number, since it is smaller than the sum of its proper divisors (245012716).

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

213115136 is an equidigital number, since it uses as much as digits as its factorization.

213115136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64066 (or 64052 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 213115136 is about 14598.4634807914. The cubic root of 213115136 is about 597.3168486806.

Adding to 213115136 its reverse (631511312), we get a palindrome (844626448).

The spelling of 213115136 in words is "two hundred thirteen million, one hundred fifteen thousand, one hundred thirty-six".