21403304032 has 24 divisors (see below), whose sum is σ = 45968460552. Its totient is φ = 9728774400.

The previous prime is 21403304029. The next prime is 21403304059. The reversal of 21403304032 is 23040330412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21403303994 and 21403304012.

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, 30402069 + ... + 30402772.

It is an arithmetic number, because the mean of its divisors is an integer number (1915352523).

Almost surely, 2^21403304032 is an apocalyptic number.

21403304032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21403304032 is an abundant number, since it is smaller than the sum of its proper divisors (24565156520).

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

21403304032 is a wasteful number, since it uses less digits than its factorization.

21403304032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60804862 (or 60804854 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21403304032 its reverse (23040330412), we get a palindrome (44443634444).

The spelling of 21403304032 in words is "twenty-one billion, four hundred three million, three hundred four thousand, thirty-two".