12435279623021 has 2 divisors, whose sum is σ = 12435279623022. Its totient is φ = 12435279623020.

The previous prime is 12435279622979. The next prime is 12435279623077. The reversal of 12435279623021 is 12032697253421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11423014242025 + 1012265380996 = 3379795^2 + 1006114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12435279623021 - 2¹⁰ = 12435279621997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12435279643021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6217639811510 + 6217639811511.

It is an arithmetic number, because the mean of its divisors is an integer number (6217639811511).

Almost surely, 2^{12435279623021} is an apocalyptic number.

It is an amenable number.

12435279623021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12435279623021 is an equidigital number, since it uses as much as digits as its factorization.

12435279623021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 12435279623021 in words is "twelve trillion, four hundred thirty-five billion, two hundred seventy-nine million, six hundred twenty-three thousand, twenty-one".