21433442304 has 56 divisors (see below), whose sum is σ = 57152423160. Its totient is φ = 7144472576.

The previous prime is 21433442281. The next prime is 21433442323. The reversal of 21433442304 is 40324433412.

It is a happy number.

It is a super-3 number, since 3×21433442304³ (a number of 32 digits) contains 333 as substring.

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, 411489 + ... + 460640.

It is an arithmetic number, because the mean of its divisors is an integer number (1020578985).

Almost surely, 2^21433442304 is an apocalyptic number.

21433442304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21433442304 is an abundant number, since it is smaller than the sum of its proper divisors (35718980856).

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

21433442304 is an frugal number, since it uses more digits than its factorization.

21433442304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872158 (or 872134 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 21433442304 its reverse (40324433412), we get a palindrome (61757875716).

The spelling of 21433442304 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty-two thousand, three hundred four".