21045443233 has 16 divisors (see below), whose sum is σ = 24476065920. Its totient is φ = 17949102336.

The previous prime is 21045443191. The next prime is 21045443257. The reversal of 21045443233 is 33234454012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21045443233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21045443195 and 21045443204.

It is not an unprimeable number, because it can be changed into a prime (21045443533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1409010 + ... + 1423867.

It is an arithmetic number, because the mean of its divisors is an integer number (1529754120).

Almost surely, 2^21045443233 is an apocalyptic number.

21045443233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21045443233 is a deficient number, since it is larger than the sum of its proper divisors (3430622687).

21045443233 is a wasteful number, since it uses less digits than its factorization.

21045443233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832936.

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

Adding to 21045443233 its reverse (33234454012), we get a palindrome (54279897245).

The spelling of 21045443233 in words is "twenty-one billion, forty-five million, four hundred forty-three thousand, two hundred thirty-three".