21404422324021 has 32 divisors (see below), whose sum is σ = 23556961209600. Its totient is φ = 19286980078080.

The previous prime is 21404422323997. The next prime is 21404422324027. The reversal of 21404422324021 is 12042322440412.

It is not a de Polignac number, because 21404422324021 - 2⁹ = 21404422323509 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 (21404422324027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2370625935 + ... + 2370634963.

It is an arithmetic number, because the mean of its divisors is an integer number (736155037800).

Almost surely, 2^{21404422324021} is an apocalyptic number.

It is an amenable number.

21404422324021 is a deficient number, since it is larger than the sum of its proper divisors (2152538885579).

21404422324021 is a wasteful number, since it uses less digits than its factorization.

21404422324021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12429.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 21404422324021 its reverse (12042322440412), we get a palindrome (33446744764433).

The spelling of 21404422324021 in words is "twenty-one trillion, four hundred four billion, four hundred twenty-two million, three hundred twenty-four thousand, twenty-one".