21404104023 has 8 divisors (see below), whose sum is σ = 29202498688. Its totient is φ = 13937556024.

The previous prime is 21404104009. The next prime is 21404104049. The reversal of 21404104023 is 32040140412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21404104023 - 2²⁶ = 21336995159 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 (21404104003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82961515 + ... + 82961772.

It is an arithmetic number, because the mean of its divisors is an integer number (3650312336).

Almost surely, 2^21404104023 is an apocalyptic number.

21404104023 is a deficient number, since it is larger than the sum of its proper divisors (7798394665).

21404104023 is a wasteful number, since it uses less digits than its factorization.

21404104023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165923333.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21404104023 its reverse (32040140412), we get a palindrome (53444244435).

The spelling of 21404104023 in words is "twenty-one billion, four hundred four million, one hundred four thousand, twenty-three".