1022001121991 has 2 divisors, whose sum is σ = 1022001121992. Its totient is φ = 1022001121990.

The previous prime is 1022001121987. The next prime is 1022001122053. The reversal of 1022001121991 is 1991211002201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1022001121991 - 2² = 1022001121987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022001121591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511000560995 + 511000560996.

It is an arithmetic number, because the mean of its divisors is an integer number (511000560996).

Almost surely, 2^{1022001121991} is an apocalyptic number.

1022001121991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022001121991 is an equidigital number, since it uses as much as digits as its factorization.

1022001121991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 1022001121991 in words is "one trillion, twenty-two billion, one million, one hundred twenty-one thousand, nine hundred ninety-one".