212022191 has 2 divisors, whose sum is σ = 212022192. Its totient is φ = 212022190.

The previous prime is 212022157. The next prime is 212022227. The reversal of 212022191 is 191220212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212022191 - 2¹⁸ = 211760047 is a prime.

It is equal to p_11707022 and since 212022191 and 11707022 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212022091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106011095 + 106011096.

It is an arithmetic number, because the mean of its divisors is an integer number (106011096).

Almost surely, 2^212022191 is an apocalyptic number.

212022191 is a deficient number, since it is larger than the sum of its proper divisors (1).

212022191 is an equidigital number, since it uses as much as digits as its factorization.

212022191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 212022191 is about 14560.9818006891. The cubic root of 212022191 is about 596.2939999203.

The spelling of 212022191 in words is "two hundred twelve million, twenty-two thousand, one hundred ninety-one".