7211405979709 has 2 divisors, whose sum is σ = 7211405979710. Its totient is φ = 7211405979708.

The previous prime is 7211405979697. The next prime is 7211405979719. The reversal of 7211405979709 is 9079795041127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4826466274084 + 2384939705625 = 2196922^2 + 1544325^2 .

It is a cyclic number.

It is not a de Polignac number, because 7211405979709 - 2²⁵ = 7211372425277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7211405979719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3605702989854 + 3605702989855.

It is an arithmetic number, because the mean of its divisors is an integer number (3605702989855).

Almost surely, 2^{7211405979709} is an apocalyptic number.

It is an amenable number.

7211405979709 is a deficient number, since it is larger than the sum of its proper divisors (1).

7211405979709 is an equidigital number, since it uses as much as digits as its factorization.

7211405979709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10001880, while the sum is 61.

The spelling of 7211405979709 in words is "seven trillion, two hundred eleven billion, four hundred five million, nine hundred seventy-nine thousand, seven hundred nine".