21908104423 has 8 divisors (see below), whose sum is σ = 22060400000. Its totient is φ = 21756231288.

The previous prime is 21908104409. The next prime is 21908104441. The reversal of 21908104423 is 32440180912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21908104423 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 (21908104523) 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, 1173 + ... + 209326.

It is an arithmetic number, because the mean of its divisors is an integer number (2757550000).

Almost surely, 2^21908104423 is an apocalyptic number.

21908104423 is a deficient number, since it is larger than the sum of its proper divisors (152295577).

21908104423 is a wasteful number, since it uses less digits than its factorization.

21908104423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211221.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 21908104423 in words is "twenty-one billion, nine hundred eight million, one hundred four thousand, four hundred twenty-three".