21043232304 has 40 divisors (see below), whose sum is σ = 54367322352. Its totient is φ = 7013683200.

The previous prime is 21043232299. The next prime is 21043232321. The reversal of 21043232304 is 40323234012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650104 + ... + 681704.

Almost surely, 2^21043232304 is an apocalyptic number.

21043232304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21043232304 is an abundant number, since it is smaller than the sum of its proper divisors (33324090048).

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

21043232304 is a wasteful number, since it uses less digits than its factorization.

21043232304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45485 (or 45479 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21043232304 its reverse (40323234012), we get a palindrome (61366466316).

The spelling of 21043232304 in words is "twenty-one billion, forty-three million, two hundred thirty-two thousand, three hundred four".