212355971 has 2 divisors, whose sum is σ = 212355972. Its totient is φ = 212355970.

The previous prime is 212355929. The next prime is 212356007. The reversal of 212355971 is 179553212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212355971 - 2⁶ = 212355907 is a prime.

It is not a weakly prime, because it can be changed into another prime (212355271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106177985 + 106177986.

It is an arithmetic number, because the mean of its divisors is an integer number (106177986).

Almost surely, 2^212355971 is an apocalyptic number.

212355971 is a deficient number, since it is larger than the sum of its proper divisors (1).

212355971 is an equidigital number, since it uses as much as digits as its factorization.

212355971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 212355971 is about 14572.4387457968. The cubic root of 212355971 is about 596.6067449508.

The spelling of 212355971 in words is "two hundred twelve million, three hundred fifty-five thousand, nine hundred seventy-one".