21033012224 has 44 divisors (see below), whose sum is σ = 48051998544. Its totient is φ = 9014145024.

The previous prime is 21033012191. The next prime is 21033012241. The reversal of 21033012224 is 42221033012.

It is a junction number, because it is equal to n+sod(n) for n = 21033012196 and 21033012205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1459979 + ... + 1474314.

It is an arithmetic number, because the mean of its divisors is an integer number (1092090876).

Almost surely, 2^21033012224 is an apocalyptic number.

It is an amenable number.

21033012224 is an abundant number, since it is smaller than the sum of its proper divisors (27018986320).

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

21033012224 is an equidigital number, since it uses as much as digits as its factorization.

21033012224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934320 (or 2934302 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21033012224 its reverse (42221033012), we get a palindrome (63254045236).

The spelling of 21033012224 in words is "twenty-one billion, thirty-three million, twelve thousand, two hundred twenty-four".