120010021991 has 2 divisors, whose sum is σ = 120010021992. Its totient is φ = 120010021990.

The previous prime is 120010021933. The next prime is 120010022017. The reversal of 120010021991 is 199120010021.

It is an a-pointer prime, because the next prime (120010022017) can be obtained adding 120010021991 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120010021991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120010021991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120010021931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60005010995 + 60005010996.

It is an arithmetic number, because the mean of its divisors is an integer number (60005010996).

Almost surely, 2^120010021991 is an apocalyptic number.

120010021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

120010021991 is an equidigital number, since it uses as much as digits as its factorization.

120010021991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 120010021991 in words is "one hundred twenty billion, ten million, twenty-one thousand, nine hundred ninety-one".