20400123413051 has 2 divisors, whose sum is σ = 20400123413052. Its totient is φ = 20400123413050.

The previous prime is 20400123413039. The next prime is 20400123413057. The reversal of 20400123413051 is 15031432100402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20400123413051 - 2³⁰ = 20399049671227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20400123413051.

It is not a weakly prime, because it can be changed into another prime (20400123413057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200061706525 + 10200061706526.

It is an arithmetic number, because the mean of its divisors is an integer number (10200061706526).

Almost surely, 2^{20400123413051} is an apocalyptic number.

20400123413051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400123413051 is an equidigital number, since it uses as much as digits as its factorization.

20400123413051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20400123413051 its reverse (15031432100402), we get a palindrome (35431555513453).

The spelling of 20400123413051 in words is "twenty trillion, four hundred billion, one hundred twenty-three million, four hundred thirteen thousand, fifty-one".