20201001121997 has 2 divisors, whose sum is σ = 20201001121998. Its totient is φ = 20201001121996.

The previous prime is 20201001121927. The next prime is 20201001122041. The reversal of 20201001121997 is 79912110010202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10684831162756 + 9516169959241 = 3268766^2 + 3084829^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201001121997 - 2²² = 20200996927693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201001121927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100500560998 + 10100500560999.

It is an arithmetic number, because the mean of its divisors is an integer number (10100500560999).

Almost surely, 2^{20201001121997} is an apocalyptic number.

It is an amenable number.

20201001121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201001121997 is an equidigital number, since it uses as much as digits as its factorization.

20201001121997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 20201001121997 in words is "twenty trillion, two hundred one billion, one million, one hundred twenty-one thousand, nine hundred ninety-seven".