120121020991 has 2 divisors, whose sum is σ = 120121020992. Its totient is φ = 120121020990.

The previous prime is 120121020931. The next prime is 120121021037. The reversal of 120121020991 is 199020121021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 120121020991 - 2²³ = 120112632383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120121020931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060510495 + 60060510496.

It is an arithmetic number, because the mean of its divisors is an integer number (60060510496).

Almost surely, 2^120121020991 is an apocalyptic number.

120121020991 is a deficient number, since it is larger than the sum of its proper divisors (1).

120121020991 is an equidigital number, since it uses as much as digits as its factorization.

120121020991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 120121020991 in words is "one hundred twenty billion, one hundred twenty-one million, twenty thousand, nine hundred ninety-one".