121392605681 has 2 divisors, whose sum is σ = 121392605682. Its totient is φ = 121392605680.

The previous prime is 121392605657. The next prime is 121392605801. The reversal of 121392605681 is 186506293121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86483046400 + 34909559281 = 294080^2 + 186841^2 .

It is an emirp because it is prime and its reverse (186506293121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121392605681 - 2³⁴ = 104212736497 is a prime.

It is a super-2 number, since 2×121392605681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121392605881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60696302840 + 60696302841.

It is an arithmetic number, because the mean of its divisors is an integer number (60696302841).

Almost surely, 2^121392605681 is an apocalyptic number.

It is an amenable number.

121392605681 is a deficient number, since it is larger than the sum of its proper divisors (1).

121392605681 is an equidigital number, since it uses as much as digits as its factorization.

121392605681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 121392605681 in words is "one hundred twenty-one billion, three hundred ninety-two million, six hundred five thousand, six hundred eighty-one".