212221031291 has 2 divisors, whose sum is σ = 212221031292. Its totient is φ = 212221031290.

The previous prime is 212221031261. The next prime is 212221031357. The reversal of 212221031291 is 192130122212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212221031291 is a prime.

It is a super-2 number, since 2×212221031291² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212221031291.

It is not a weakly prime, because it can be changed into another prime (212221031261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110515645 + 106110515646.

It is an arithmetic number, because the mean of its divisors is an integer number (106110515646).

Almost surely, 2^212221031291 is an apocalyptic number.

212221031291 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221031291 is an equidigital number, since it uses as much as digits as its factorization.

212221031291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 212221031291 in words is "two hundred twelve billion, two hundred twenty-one million, thirty-one thousand, two hundred ninety-one".