121915553801 has 2 divisors, whose sum is σ = 121915553802. Its totient is φ = 121915553800.

The previous prime is 121915553717. The next prime is 121915553807. The reversal of 121915553801 is 108355519121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121608428176 + 307125625 = 348724^2 + 17525^2 .

It is a cyclic number.

It is not a de Polignac number, because 121915553801 - 2³⁴ = 104735684617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121915553807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60957776900 + 60957776901.

It is an arithmetic number, because the mean of its divisors is an integer number (60957776901).

Almost surely, 2^121915553801 is an apocalyptic number.

It is an amenable number.

121915553801 is a deficient number, since it is larger than the sum of its proper divisors (1).

121915553801 is an equidigital number, since it uses as much as digits as its factorization.

121915553801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 41.

The spelling of 121915553801 in words is "one hundred twenty-one billion, nine hundred fifteen million, five hundred fifty-three thousand, eight hundred one".