1020122011991 has 2 divisors, whose sum is σ = 1020122011992. Its totient is φ = 1020122011990.

The previous prime is 1020122011927. The next prime is 1020122012051. The reversal of 1020122011991 is 1991102210201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020122011991 - 2⁶ = 1020122011927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020122011901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510061005995 + 510061005996.

It is an arithmetic number, because the mean of its divisors is an integer number (510061005996).

Almost surely, 2^{1020122011991} is an apocalyptic number.

1020122011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020122011991 is an equidigital number, since it uses as much as digits as its factorization.

1020122011991 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 29.

The spelling of 1020122011991 in words is "one trillion, twenty billion, one hundred twenty-two million, eleven thousand, nine hundred ninety-one".