2122021221997 has 2 divisors, whose sum is σ = 2122021221998. Its totient is φ = 2122021221996.

The previous prime is 2122021221953. The next prime is 2122021222051. The reversal of 2122021221997 is 7991221202212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1119912111081 + 1002109110916 = 1058259^2 + 1001054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2122021221997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122021251997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061010610998 + 1061010610999.

It is an arithmetic number, because the mean of its divisors is an integer number (1061010610999).

Almost surely, 2^{2122021221997} is an apocalyptic number.

It is an amenable number.

2122021221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122021221997 is an equidigital number, since it uses as much as digits as its factorization.

2122021221997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 2122021221997 in words is "two trillion, one hundred twenty-two billion, twenty-one million, two hundred twenty-one thousand, nine hundred ninety-seven".