2021011120991 has 2 divisors, whose sum is σ = 2021011120992. Its totient is φ = 2021011120990.

The previous prime is 2021011120949. The next prime is 2021011121083. The reversal of 2021011120991 is 1990211101202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021011120991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021011120091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010505560495 + 1010505560496.

It is an arithmetic number, because the mean of its divisors is an integer number (1010505560496).

Almost surely, 2^{2021011120991} is an apocalyptic number.

2021011120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021011120991 is an equidigital number, since it uses as much as digits as its factorization.

2021011120991 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 2021011120991 in words is "two trillion, twenty-one billion, eleven million, one hundred twenty thousand, nine hundred ninety-one".