212001122110021 has 2 divisors, whose sum is σ = 212001122110022. Its totient is φ = 212001122110020.

The previous prime is 212001122109989. The next prime is 212001122110033. The reversal of 212001122110021 is 120011221100212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173290501080225 + 38710621029796 = 13163985^2 + 6221786^2 .

It is a cyclic number.

It is not a de Polignac number, because 212001122110021 - 2⁵ = 212001122109989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212001122109977 and 212001122110004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212001122110061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000561055010 + 106000561055011.

It is an arithmetic number, because the mean of its divisors is an integer number (106000561055011).

Almost surely, 2^{212001122110021} is an apocalyptic number.

It is an amenable number.

212001122110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001122110021 is an equidigital number, since it uses as much as digits as its factorization.

212001122110021 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 212001122110021 its reverse (120011221100212), we get a palindrome (332012343210233).

It can be divided in two parts, 2 and 12001122110021, that multiplied together give a palindrome (24002244220042).

The spelling of 212001122110021 in words is "two hundred twelve trillion, one billion, one hundred twenty-two million, one hundred ten thousand, twenty-one".