212370991 has 4 divisors (see below), whose sum is σ = 242709712. Its totient is φ = 182032272.

The previous prime is 212370989. The next prime is 212371001. The reversal of 212370991 is 199073212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212370991 - 2¹ = 212370989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212370911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15169350 + ... + 15169363.

It is an arithmetic number, because the mean of its divisors is an integer number (60677428).

Almost surely, 2^212370991 is an apocalyptic number.

212370991 is a deficient number, since it is larger than the sum of its proper divisors (30338721).

212370991 is an equidigital number, since it uses as much as digits as its factorization.

212370991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30338720.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 212370991 is about 14572.9540931137. The cubic root of 212370991 is about 596.6208106758.

The spelling of 212370991 in words is "two hundred twelve million, three hundred seventy thousand, nine hundred ninety-one".