21431396304 has 120 divisors (see below), whose sum is σ = 61593772032. Its totient is φ = 6953506560.

The previous prime is 21431396293. The next prime is 21431396323. The reversal of 21431396304 is 40369313412.

21431396304 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 13 + 9 + 630 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 958209 + ... + 980319.

Almost surely, 2^21431396304 is an apocalyptic number.

21431396304 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 21431396304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30796886016).

21431396304 is an abundant number, since it is smaller than the sum of its proper divisors (40162375728).

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

21431396304 is a wasteful number, since it uses less digits than its factorization.

21431396304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22305 (or 22296 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 21431396304 in words is "twenty-one billion, four hundred thirty-one million, three hundred ninety-six thousand, three hundred four".