212471939 has 2 divisors, whose sum is σ = 212471940. Its totient is φ = 212471938.

The previous prime is 212471911. The next prime is 212471969. The reversal of 212471939 is 939174212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212471939 is a prime.

It is not a weakly prime, because it can be changed into another prime (212471969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106235969 + 106235970.

It is an arithmetic number, because the mean of its divisors is an integer number (106235970).

Almost surely, 2^212471939 is an apocalyptic number.

212471939 is a deficient number, since it is larger than the sum of its proper divisors (1).

212471939 is an equidigital number, since it uses as much as digits as its factorization.

212471939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 212471939 is about 14576.4172209772. The cubic root of 212471939 is about 596.7153278804.

The spelling of 212471939 in words is "two hundred twelve million, four hundred seventy-one thousand, nine hundred thirty-nine".