20423014442421 has 4 divisors (see below), whose sum is σ = 27230685923232. Its totient is φ = 13615342961612.

The previous prime is 20423014442357. The next prime is 20423014442431. The reversal of 20423014442421 is 12424441032402.

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 20423014442421 - 2⁶ = 20423014442357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423014442431) 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, 3403835740401 + ... + 3403835740406.

It is an arithmetic number, because the mean of its divisors is an integer number (6807671480808).

Almost surely, 2^{20423014442421} is an apocalyptic number.

It is an amenable number.

20423014442421 is a deficient number, since it is larger than the sum of its proper divisors (6807671480811).

20423014442421 is an equidigital number, since it uses as much as digits as its factorization.

20423014442421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6807671480810.

The product of its (nonzero) digits is 49152, while the sum is 33.

Adding to 20423014442421 its reverse (12424441032402), we get a palindrome (32847455474823).

The spelling of 20423014442421 in words is "twenty trillion, four hundred twenty-three billion, fourteen million, four hundred forty-two thousand, four hundred twenty-one".