121020201997 has 2 divisors, whose sum is σ = 121020201998. Its totient is φ = 121020201996.

The previous prime is 121020201901. The next prime is 121020202019. The reversal of 121020201997 is 799102020121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87740956521 + 33279245476 = 296211^2 + 182426^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020201997 - 2²⁷ = 120885984269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121020205997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510100998 + 60510100999.

It is an arithmetic number, because the mean of its divisors is an integer number (60510100999).

Almost surely, 2^121020201997 is an apocalyptic number.

It is an amenable number.

121020201997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020201997 is an equidigital number, since it uses as much as digits as its factorization.

121020201997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 121020201997 in words is "one hundred twenty-one billion, twenty million, two hundred one thousand, nine hundred ninety-seven".