21654316704 has 96 divisors (see below), whose sum is σ = 59342976000. Its totient is φ = 6905170944.

The previous prime is 21654316699. The next prime is 21654316741. The reversal of 21654316704 is 40761345612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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, 267777 + ... + 339135.

It is an arithmetic number, because the mean of its divisors is an integer number (618156000).

Almost surely, 2^21654316704 is an apocalyptic number.

21654316704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21654316704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29671488000).

21654316704 is an abundant number, since it is smaller than the sum of its proper divisors (37688659296).

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

21654316704 is a wasteful number, since it uses less digits than its factorization.

21654316704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71510 (or 71502 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 21654316704 in words is "twenty-one billion, six hundred fifty-four million, three hundred sixteen thousand, seven hundred four".