212112211000021 has 2 divisors, whose sum is σ = 212112211000022. Its totient is φ = 212112211000020.

The previous prime is 212112210999959. The next prime is 212112211000061. The reversal of 212112211000021 is 120000112211212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183242544697521 + 28869666302500 = 13536711^2 + 5373050^2 .

It is a cyclic number.

It is not a de Polignac number, because 212112211000021 - 2²⁵ = 212112177445589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212112210999959 and 212112211000004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212112211000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106056105500010 + 106056105500011.

It is an arithmetic number, because the mean of its divisors is an integer number (106056105500011).

Almost surely, 2^{212112211000021} is an apocalyptic number.

It is an amenable number.

212112211000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212112211000021 is an equidigital number, since it uses as much as digits as its factorization.

212112211000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212112211000021 its reverse (120000112211212), we get a palindrome (332112323211233).

The spelling of 212112211000021 in words is "two hundred twelve trillion, one hundred twelve billion, two hundred eleven million, twenty-one", and thus it is an aban number.