20121997025797 has 2 divisors, whose sum is σ = 20121997025798. Its totient is φ = 20121997025796.

The previous prime is 20121997025791. The next prime is 20121997025827. The reversal of 20121997025797 is 79752079912102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16232526739521 + 3889470286276 = 4028961^2 + 1972174^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121997025797 - 2¹¹ = 20121997023749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121997025791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060998512898 + 10060998512899.

It is an arithmetic number, because the mean of its divisors is an integer number (10060998512899).

Almost surely, 2^{20121997025797} is an apocalyptic number.

It is an amenable number.

20121997025797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121997025797 is an equidigital number, since it uses as much as digits as its factorization.

20121997025797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10001880, while the sum is 61.

The spelling of 20121997025797 in words is "twenty trillion, one hundred twenty-one billion, nine hundred ninety-seven million, twenty-five thousand, seven hundred ninety-seven".