212012211121021 has 2 divisors, whose sum is σ = 212012211121022. Its totient is φ = 212012211121020.

The previous prime is 212012211121003. The next prime is 212012211121033. The reversal of 212012211121021 is 120121112210212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209804651083225 + 2207560037796 = 14484635^2 + 1485786^2 .

It is a cyclic number.

It is not a de Polignac number, because 212012211121021 - 2⁵ = 212012211120989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212012211121021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212012211121001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106006105560510 + 106006105560511.

It is an arithmetic number, because the mean of its divisors is an integer number (106006105560511).

Almost surely, 2^{212012211121021} is an apocalyptic number.

It is an amenable number.

212012211121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212012211121021 is an equidigital number, since it uses as much as digits as its factorization.

212012211121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212012211121021 its reverse (120121112210212), we get a palindrome (332133323331233).

The spelling of 212012211121021 in words is "two hundred twelve trillion, twelve billion, two hundred eleven million, one hundred twenty-one thousand, twenty-one".