2116622312621 has 2 divisors, whose sum is σ = 2116622312622. Its totient is φ = 2116622312620.

The previous prime is 2116622312591. The next prime is 2116622312639. The reversal of 2116622312621 is 1262132266112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1656652152100 + 459970160521 = 1287110^2 + 678211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2116622312621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2116622312681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058311156310 + 1058311156311.

It is an arithmetic number, because the mean of its divisors is an integer number (1058311156311).

Almost surely, 2^{2116622312621} is an apocalyptic number.

It is an amenable number.

2116622312621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116622312621 is an equidigital number, since it uses as much as digits as its factorization.

2116622312621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

Adding to 2116622312621 its reverse (1262132266112), we get a palindrome (3378754578733).

The spelling of 2116622312621 in words is "two trillion, one hundred sixteen billion, six hundred twenty-two million, three hundred twelve thousand, six hundred twenty-one".