21033203044 has 48 divisors (see below), whose sum is σ = 42434703360. Its totient is φ = 8935436160.

The previous prime is 21033203021. The next prime is 21033203069. The reversal of 21033203044 is 44030233012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6075474 + ... + 6078934.

It is an arithmetic number, because the mean of its divisors is an integer number (884056320).

Almost surely, 2^21033203044 is an apocalyptic number.

It is an amenable number.

21033203044 is an abundant number, since it is smaller than the sum of its proper divisors (21401500316).

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

21033203044 is a wasteful number, since it uses less digits than its factorization.

21033203044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5308 (or 5306 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21033203044 its reverse (44030233012), we get a palindrome (65063436056).

The spelling of 21033203044 in words is "twenty-one billion, thirty-three million, two hundred three thousand, forty-four".