212195251 has 2 divisors, whose sum is σ = 212195252. Its totient is φ = 212195250.

The previous prime is 212195219. The next prime is 212195267. The reversal of 212195251 is 152591212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212195251 - 2⁵ = 212195219 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212195281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106097625 + 106097626.

It is an arithmetic number, because the mean of its divisors is an integer number (106097626).

Almost surely, 2^212195251 is an apocalyptic number.

212195251 is a deficient number, since it is larger than the sum of its proper divisors (1).

212195251 is an equidigital number, since it uses as much as digits as its factorization.

212195251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 28.

The square root of 212195251 is about 14566.9231823333. The cubic root of 212195251 is about 596.4561945391.

The spelling of 212195251 in words is "two hundred twelve million, one hundred ninety-five thousand, two hundred fifty-one".