20126256105421 has 32 divisors (see below), whose sum is σ = 20652909355008. Its totient is φ = 19607718574080.

The previous prime is 20126256105407. The next prime is 20126256105443. The reversal of 20126256105421 is 12450165262102.

It is a cyclic number.

It is not a de Polignac number, because 20126256105421 - 2²⁵ = 20126222550989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20126256105481) 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 in 31 ways as a sum of consecutive naturals, for example, 5015262411 + ... + 5015266423.

It is an arithmetic number, because the mean of its divisors is an integer number (645403417344).

Almost surely, 2^{20126256105421} is an apocalyptic number.

It is an amenable number.

20126256105421 is a deficient number, since it is larger than the sum of its proper divisors (526653249587).

20126256105421 is a wasteful number, since it uses less digits than its factorization.

20126256105421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6301.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 20126256105421 in words is "twenty trillion, one hundred twenty-six billion, two hundred fifty-six million, one hundred five thousand, four hundred twenty-one".