21423112414021 has 4 divisors (see below), whose sum is σ = 21436344727200. Its totient is φ = 21409880100844.

The previous prime is 21423112414019. The next prime is 21423112414037. The reversal of 21423112414021 is 12041421132412.

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 21423112414021 - 2¹ = 21423112414019 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 (21423112412021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6616154161 + ... + 6616157398.

It is an arithmetic number, because the mean of its divisors is an integer number (5359086181800).

Almost surely, 2^{21423112414021} is an apocalyptic number.

It is an amenable number.

21423112414021 is a deficient number, since it is larger than the sum of its proper divisors (13232313179).

21423112414021 is a wasteful number, since it uses less digits than its factorization.

21423112414021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13232313178.

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 21423112414021 its reverse (12041421132412), we get a palindrome (33464533546433).

The spelling of 21423112414021 in words is "twenty-one trillion, four hundred twenty-three billion, one hundred twelve million, four hundred fourteen thousand, twenty-one".