213142239 has 8 divisors (see below), whose sum is σ = 315766320. Its totient is φ = 142094808.

The previous prime is 213142217. The next prime is 213142253. The reversal of 213142239 is 932241312.

It is a happy number.

It is not a de Polignac number, because 213142239 - 2⁵ = 213142207 is a prime.

It is a super-2 number, since 2×213142239² = 90859228091866242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7894157 = 213142239 / (2 + 1 + 3 + 1 + 4 + 2 + 2 + 3 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213142289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3947052 + ... + 3947105.

It is an arithmetic number, because the mean of its divisors is an integer number (39470790).

Almost surely, 2^213142239 is an apocalyptic number.

213142239 is a deficient number, since it is larger than the sum of its proper divisors (102624081).

213142239 is an equidigital number, since it uses as much as digits as its factorization.

213142239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7894166 (or 7894160 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 213142239 is about 14599.3917339045. The cubic root of 213142239 is about 597.3421689411.

The spelling of 213142239 in words is "two hundred thirteen million, one hundred forty-two thousand, two hundred thirty-nine".