212164231 has 4 divisors (see below), whose sum is σ = 212329864. Its totient is φ = 211998600.

The previous prime is 212164219. The next prime is 212164243. The reversal of 212164231 is 132461212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (212164219) and next prime (212164243).

It is a cyclic number.

It is not a de Polignac number, because 212164231 - 2⁹ = 212163719 is a prime.

It is a super-2 number, since 2×212164231² = 90027321831642722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212164331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80880 + ... + 83461.

It is an arithmetic number, because the mean of its divisors is an integer number (53082466).

Almost surely, 2^212164231 is an apocalyptic number.

212164231 is a deficient number, since it is larger than the sum of its proper divisors (165633).

212164231 is a wasteful number, since it uses less digits than its factorization.

212164231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165632.

The product of its digits is 576, while the sum is 22.

The square root of 212164231 is about 14565.8584024423. The cubic root of 212164231 is about 596.4271285842.

The spelling of 212164231 in words is "two hundred twelve million, one hundred sixty-four thousand, two hundred thirty-one".