213113331 has 12 divisors (see below), whose sum is σ = 321214608. Its totient is φ = 135898224.

The previous prime is 213113317. The next prime is 213113339. The reversal of 213113331 is 133311312.

It is a happy number.

213113331 is a `hidden beast` number, since 21 + 311 + 3 + 331 = 666.

It is not a de Polignac number, because 213113331 - 2¹⁸ = 212851187 is a prime.

It is a super-2 number, since 2×213113331² = 90834583699831122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213113339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 514560 + ... + 514973.

It is an arithmetic number, because the mean of its divisors is an integer number (26767884).

Almost surely, 2^213113331 is an apocalyptic number.

213113331 is a deficient number, since it is larger than the sum of its proper divisors (108101277).

213113331 is a wasteful number, since it uses less digits than its factorization.

213113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029562 (or 1029559 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 213113331 is about 14598.4016590858. The cubic root of 213113331 is about 597.3151623308.

Adding to 213113331 its reverse (133311312), we get a palindrome (346424643).

It can be divided in two parts, 213113 and 331, that added together give a square (213444 = 462²).

The spelling of 213113331 in words is "two hundred thirteen million, one hundred thirteen thousand, three hundred thirty-one".