2111266535621 has 2 divisors, whose sum is σ = 2111266535622. Its totient is φ = 2111266535620.

The previous prime is 2111266535597. The next prime is 2111266535629. The reversal of 2111266535621 is 1265356621112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2038501473121 + 72765062500 = 1427761^2 + 269750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111266535621 - 2⁶ = 2111266535557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111266535629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055633267810 + 1055633267811.

It is an arithmetic number, because the mean of its divisors is an integer number (1055633267811).

Almost surely, 2^{2111266535621} is an apocalyptic number.

It is an amenable number.

2111266535621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111266535621 is an equidigital number, since it uses as much as digits as its factorization.

2111266535621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The spelling of 2111266535621 in words is "two trillion, one hundred eleven billion, two hundred sixty-six million, five hundred thirty-five thousand, six hundred twenty-one".