212939231 has 2 divisors, whose sum is σ = 212939232. Its totient is φ = 212939230.

The previous prime is 212939197. The next prime is 212939261. The reversal of 212939231 is 132939212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212939231 - 2²⁶ = 145830367 is a prime.

It is a super-2 number, since 2×212939231² = 90686232197742722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212939261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106469615 + 106469616.

It is an arithmetic number, because the mean of its divisors is an integer number (106469616).

Almost surely, 2^212939231 is an apocalyptic number.

212939231 is a deficient number, since it is larger than the sum of its proper divisors (1).

212939231 is an equidigital number, since it uses as much as digits as its factorization.

212939231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 212939231 is about 14592.4374591773. The cubic root of 212939231 is about 597.1524618863.

The spelling of 212939231 in words is "two hundred twelve million, nine hundred thirty-nine thousand, two hundred thirty-one".