121995640841 has 2 divisors, whose sum is σ = 121995640842. Its totient is φ = 121995640840.

The previous prime is 121995640807. The next prime is 121995640883. The reversal of 121995640841 is 148046599121.

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., 77337385216 + 44658255625 = 278096^2 + 211325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121995640841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121995640841.

It is not a weakly prime, because it can be changed into another prime (121995640891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60997820420 + 60997820421.

It is an arithmetic number, because the mean of its divisors is an integer number (60997820421).

Almost surely, 2^121995640841 is an apocalyptic number.

It is an amenable number.

121995640841 is a deficient number, since it is larger than the sum of its proper divisors (1).

121995640841 is an equidigital number, since it uses as much as digits as its factorization.

121995640841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 121995640841 in words is "one hundred twenty-one billion, nine hundred ninety-five million, six hundred forty thousand, eight hundred forty-one".