21423423804344 has 64 divisors (see below), whose sum is σ = 41147579456640. Its totient is φ = 10452125122560.

The previous prime is 21423423804331. The next prime is 21423423804373. The reversal of 21423423804344 is 44340832432412.

It is a junction number, because it is equal to n+sod(n) for n = 21423423804295 and 21423423804304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901609424 + ... + 901633184.

It is an arithmetic number, because the mean of its divisors is an integer number (642930929010).

Almost surely, 2^{21423423804344} is an apocalyptic number.

It is an amenable number.

21423423804344 is a deficient number, since it is larger than the sum of its proper divisors (19724155652296).

21423423804344 is a wasteful number, since it uses less digits than its factorization.

21423423804344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30960 (or 30956 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 44.

The spelling of 21423423804344 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-three million, eight hundred four thousand, three hundred forty-four".