22020010021991 has 2 divisors, whose sum is σ = 22020010021992. Its totient is φ = 22020010021990.

The previous prime is 22020010021987. The next prime is 22020010022027. The reversal of 22020010021991 is 19912001002022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22020010021991 - 2² = 22020010021987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22020010021921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010005010995 + 11010005010996.

It is an arithmetic number, because the mean of its divisors is an integer number (11010005010996).

Almost surely, 2^{22020010021991} is an apocalyptic number.

22020010021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22020010021991 is an equidigital number, since it uses as much as digits as its factorization.

22020010021991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 22020010021991 in words is "twenty-two trillion, twenty billion, ten million, twenty-one thousand, nine hundred ninety-one".