212220191 has 2 divisors, whose sum is σ = 212220192. Its totient is φ = 212220190.

The previous prime is 212220157. The next prime is 212220247. The reversal of 212220191 is 191022212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212220191 - 2¹⁰ = 212219167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212220121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110095 + 106110096.

It is an arithmetic number, because the mean of its divisors is an integer number (106110096).

Almost surely, 2^212220191 is an apocalyptic number.

212220191 is a deficient number, since it is larger than the sum of its proper divisors (1).

212220191 is an equidigital number, since it uses as much as digits as its factorization.

212220191 is an odious number, because the sum of its binary digits is odd.

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

The square root of 212220191 is about 14567.7792061796. The cubic root of 212220191 is about 596.4795614377.

The spelling of 212220191 in words is "two hundred twelve million, two hundred twenty thousand, one hundred ninety-one".