21504260406 has 8 divisors (see below), whose sum is σ = 43008520824. Its totient is φ = 7168086800.

The previous prime is 21504260387. The next prime is 21504260417. The reversal of 21504260406 is 60406240512.

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

21504260406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1792021695 + ... + 1792021706.

It is an arithmetic number, because the mean of its divisors is an integer number (5376065103).

Almost surely, 2^21504260406 is an apocalyptic number.

21504260406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21504260406 is a wasteful number, since it uses less digits than its factorization.

21504260406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584043406.

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21504260406 in words is "twenty-one billion, five hundred four million, two hundred sixty thousand, four hundred six".