22121109373549 has 2 divisors, whose sum is σ = 22121109373550. Its totient is φ = 22121109373548.

The previous prime is 22121109373529. The next prime is 22121109373691. The reversal of 22121109373549 is 94537390112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20100427222500 + 2020682151049 = 4483350^2 + 1421507^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121109373549 - 2³⁷ = 21983670420077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121109373529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060554686774 + 11060554686775.

It is an arithmetic number, because the mean of its divisors is an integer number (11060554686775).

Almost surely, 2^{22121109373549} is an apocalyptic number.

It is an amenable number.

22121109373549 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121109373549 is an equidigital number, since it uses as much as digits as its factorization.

22121109373549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 22121109373549 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred nine million, three hundred seventy-three thousand, five hundred forty-nine".