212112212994821 has 2 divisors, whose sum is σ = 212112212994822. Its totient is φ = 212112212994820.

The previous prime is 212112212994811. The next prime is 212112212994827. The reversal of 212112212994821 is 128499212211212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123372779728900 + 88739433265921 = 11107330^2 + 9420161^2 .

It is a cyclic number.

It is not a de Polignac number, because 212112212994821 - 2⁴² = 207714166483717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212112212994827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106056106497410 + 106056106497411.

It is an arithmetic number, because the mean of its divisors is an integer number (106056106497411).

Almost surely, 2^{212112212994821} is an apocalyptic number.

It is an amenable number.

212112212994821 is a deficient number, since it is larger than the sum of its proper divisors (1).

212112212994821 is an equidigital number, since it uses as much as digits as its factorization.

212112212994821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 47.

The spelling of 212112212994821 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred twelve million, nine hundred ninety-four thousand, eight hundred twenty-one".