21333045424 has 20 divisors (see below), whose sum is σ = 42758044560. Its totient is φ = 10298711360.

The previous prime is 21333045413. The next prime is 21333045443. The reversal of 21333045424 is 42454033312.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22987732 + ... + 22988659.

It is an arithmetic number, because the mean of its divisors is an integer number (2137902228).

Almost surely, 2^21333045424 is an apocalyptic number.

It is an amenable number.

21333045424 is an abundant number, since it is smaller than the sum of its proper divisors (21424999136).

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

21333045424 is a wasteful number, since it uses less digits than its factorization.

21333045424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45976428 (or 45976422 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21333045424 its reverse (42454033312), we get a palindrome (63787078736).

The spelling of 21333045424 in words is "twenty-one billion, three hundred thirty-three million, forty-five thousand, four hundred twenty-four".