213242279 has 2 divisors, whose sum is σ = 213242280. Its totient is φ = 213242278.

The previous prime is 213242221. The next prime is 213242291. The reversal of 213242279 is 972242312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213242279 - 2²⁰ = 212193703 is a prime.

It is a super-2 number, since 2×213242279² = 90944539106227682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213242179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106621139 + 106621140.

It is an arithmetic number, because the mean of its divisors is an integer number (106621140).

Almost surely, 2^213242279 is an apocalyptic number.

213242279 is a deficient number, since it is larger than the sum of its proper divisors (1).

213242279 is an equidigital number, since it uses as much as digits as its factorization.

213242279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 213242279 is about 14602.8175021124. The cubic root of 213242279 is about 597.4356100847.

The spelling of 213242279 in words is "two hundred thirteen million, two hundred forty-two thousand, two hundred seventy-nine".