20112102021997 has 2 divisors, whose sum is σ = 20112102021998. Its totient is φ = 20112102021996.

The previous prime is 20112102021989. The next prime is 20112102022031. The reversal of 20112102021997 is 79912020121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19839799647721 + 272302374276 = 4454189^2 + 521826^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112102021997 - 2³ = 20112102021989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20112102021397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056051010998 + 10056051010999.

It is an arithmetic number, because the mean of its divisors is an integer number (10056051010999).

Almost surely, 2^{20112102021997} is an apocalyptic number.

It is an amenable number.

20112102021997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112102021997 is an equidigital number, since it uses as much as digits as its factorization.

20112102021997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 20112102021997 in words is "twenty trillion, one hundred twelve billion, one hundred two million, twenty-one thousand, nine hundred ninety-seven".