20112131400161 has 2 divisors, whose sum is σ = 20112131400162. Its totient is φ = 20112131400160.

The previous prime is 20112131400143. The next prime is 20112131400253. The reversal of 20112131400161 is 16100413121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19255246086400 + 856885313761 = 4388080^2 + 925681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112131400161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20112131405161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056065700080 + 10056065700081.

It is an arithmetic number, because the mean of its divisors is an integer number (10056065700081).

Almost surely, 2^{20112131400161} is an apocalyptic number.

It is an amenable number.

20112131400161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112131400161 is an equidigital number, since it uses as much as digits as its factorization.

20112131400161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 20112131400161 its reverse (16100413121102), we get a palindrome (36212544521263).

The spelling of 20112131400161 in words is "twenty trillion, one hundred twelve billion, one hundred thirty-one million, four hundred thousand, one hundred sixty-one".