212434431991 has 2 divisors, whose sum is σ = 212434431992. Its totient is φ = 212434431990.

The previous prime is 212434431983. The next prime is 212434432061. The reversal of 212434431991 is 199134434212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212434431991 - 2³ = 212434431983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212434431971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106217215995 + 106217215996.

It is an arithmetic number, because the mean of its divisors is an integer number (106217215996).

Almost surely, 2^212434431991 is an apocalyptic number.

212434431991 is a deficient number, since it is larger than the sum of its proper divisors (1).

212434431991 is an equidigital number, since it uses as much as digits as its factorization.

212434431991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The spelling of 212434431991 in words is "two hundred twelve billion, four hundred thirty-four million, four hundred thirty-one thousand, nine hundred ninety-one".