101212211120021 has 2 divisors, whose sum is σ = 101212211120022. Its totient is φ = 101212211120020.

The previous prime is 101212211120011. The next prime is 101212211120063. The reversal of 101212211120021 is 120021112212101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98094465190225 + 3117745929796 = 9904265^2 + 1765714^2 .

It is a cyclic number.

It is not a de Polignac number, because 101212211120021 - 2²⁶ = 101212144011157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101212211120011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50606105560010 + 50606105560011.

It is an arithmetic number, because the mean of its divisors is an integer number (50606105560011).

Almost surely, 2^{101212211120021} is an apocalyptic number.

It is an amenable number.

101212211120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101212211120021 is an equidigital number, since it uses as much as digits as its factorization.

101212211120021 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 17.

Adding to 101212211120021 its reverse (120021112212101), we get a palindrome (221233323332122).

The spelling of 101212211120021 in words is "one hundred one trillion, two hundred twelve billion, two hundred eleven million, one hundred twenty thousand, twenty-one".