20126372355421 has 4 divisors (see below), whose sum is σ = 21001432023072. Its totient is φ = 19251312687772.

The previous prime is 20126372355373. The next prime is 20126372355491. The reversal of 20126372355421 is 12455327362102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20126372355421 - 2⁷ = 20126372355293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20126372355491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437529833791 + ... + 437529833836.

It is an arithmetic number, because the mean of its divisors is an integer number (5250358005768).

Almost surely, 2^{20126372355421} is an apocalyptic number.

It is an amenable number.

20126372355421 is a deficient number, since it is larger than the sum of its proper divisors (875059667651).

20126372355421 is an equidigital number, since it uses as much as digits as its factorization.

20126372355421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875059667650.

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 20126372355421 in words is "twenty trillion, one hundred twenty-six billion, three hundred seventy-two million, three hundred fifty-five thousand, four hundred twenty-one".