2311212200021 has 2 divisors, whose sum is σ = 2311212200022. Its totient is φ = 2311212200020.

The previous prime is 2311212199981. The next prime is 2311212200039. The reversal of 2311212200021 is 1200022121132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1460196724996 + 851015475025 = 1208386^2 + 922505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2311212200021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2311212200041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155606100010 + 1155606100011.

It is an arithmetic number, because the mean of its divisors is an integer number (1155606100011).

Almost surely, 2^{2311212200021} is an apocalyptic number.

It is an amenable number.

2311212200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311212200021 is an equidigital number, since it uses as much as digits as its factorization.

2311212200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2311212200021 its reverse (1200022121132), we get a palindrome (3511234321153).

The spelling of 2311212200021 in words is "two trillion, three hundred eleven billion, two hundred twelve million, two hundred thousand, twenty-one".