220120111997 has 2 divisors, whose sum is σ = 220120111998. Its totient is φ = 220120111996.

The previous prime is 220120111987. The next prime is 220120112041. The reversal of 220120111997 is 799111021022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196586711161 + 23533400836 = 443381^2 + 153406^2 .

It is a cyclic number.

It is not a de Polignac number, because 220120111997 - 2¹² = 220120107901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220120111987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110060055998 + 110060055999.

It is an arithmetic number, because the mean of its divisors is an integer number (110060055999).

Almost surely, 2^220120111997 is an apocalyptic number.

It is an amenable number.

220120111997 is a deficient number, since it is larger than the sum of its proper divisors (1).

220120111997 is an equidigital number, since it uses as much as digits as its factorization.

220120111997 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 220120111997 in words is "two hundred twenty billion, one hundred twenty million, one hundred eleven thousand, nine hundred ninety-seven".