20443004121997 has 2 divisors, whose sum is σ = 20443004121998. Its totient is φ = 20443004121996.

The previous prime is 20443004121983. The next prime is 20443004122019. The reversal of 20443004121997 is 79912140034402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14595922252521 + 5847081869476 = 3820461^2 + 2418074^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443004121997 - 2²⁷ = 20442869904269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20443004121907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221502060998 + 10221502060999.

It is an arithmetic number, because the mean of its divisors is an integer number (10221502060999).

Almost surely, 2^{20443004121997} is an apocalyptic number.

It is an amenable number.

20443004121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20443004121997 is an equidigital number, since it uses as much as digits as its factorization.

20443004121997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 20443004121997 in words is "twenty trillion, four hundred forty-three billion, four million, one hundred twenty-one thousand, nine hundred ninety-seven".