210211212391 has 2 divisors, whose sum is σ = 210211212392. Its totient is φ = 210211212390.

The previous prime is 210211212383. The next prime is 210211212451. The reversal of 210211212391 is 193212112012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210211212391 - 2³ = 210211212383 is a prime.

It is a super-2 number, since 2×210211212391² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210211212301) 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, 105105606195 + 105105606196.

It is an arithmetic number, because the mean of its divisors is an integer number (105105606196).

Almost surely, 2^210211212391 is an apocalyptic number.

210211212391 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211212391 is an equidigital number, since it uses as much as digits as its factorization.

210211212391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 210211212391 in words is "two hundred ten billion, two hundred eleven million, two hundred twelve thousand, three hundred ninety-one".