211122200021 has 2 divisors, whose sum is σ = 211122200022. Its totient is φ = 211122200020.

The previous prime is 211122199993. The next prime is 211122200057. The reversal of 211122200021 is 120002221112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106334035921 + 104788164100 = 326089^2 + 323710^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122200021 - 2¹⁰ = 211122198997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211122199969 and 211122200005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211122202021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561100010 + 105561100011.

It is an arithmetic number, because the mean of its divisors is an integer number (105561100011).

Almost surely, 2^211122200021 is an apocalyptic number.

It is an amenable number.

211122200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211122200021 is an equidigital number, since it uses as much as digits as its factorization.

211122200021 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 14.

Adding to 211122200021 its reverse (120002221112), we get a palindrome (331124421133).

The spelling of 211122200021 in words is "two hundred eleven billion, one hundred twenty-two million, two hundred thousand, twenty-one".