20012112423731 has 2 divisors, whose sum is σ = 20012112423732. Its totient is φ = 20012112423730.

The previous prime is 20012112423679. The next prime is 20012112423791. The reversal of 20012112423731 is 13732421121002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012112423731 is a prime.

It is a super-2 number, since 2×20012112423731² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012112423694 and 20012112423703.

It is not a weakly prime, because it can be changed into another prime (20012112423791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006056211865 + 10006056211866.

It is an arithmetic number, because the mean of its divisors is an integer number (10006056211866).

Almost surely, 2^{20012112423731} is an apocalyptic number.

20012112423731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012112423731 is an equidigital number, since it uses as much as digits as its factorization.

20012112423731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 20012112423731 its reverse (13732421121002), we get a palindrome (33744533544733).

The spelling of 20012112423731 in words is "twenty trillion, twelve billion, one hundred twelve million, four hundred twenty-three thousand, seven hundred thirty-one".