21044051020 has 48 divisors (see below), whose sum is σ = 46522123200. Its totient is φ = 7980363776.

The previous prime is 21044051011. The next prime is 21044051059. The reversal of 21044051020 is 2015044012.

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 15 ways as a sum of consecutive naturals, for example, 150445 + ... + 254404.

It is an arithmetic number, because the mean of its divisors is an integer number (969210900).

Almost surely, 2^21044051020 is an apocalyptic number.

21044051020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044051020 is an abundant number, since it is smaller than the sum of its proper divisors (25478072180).

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

21044051020 is a wasteful number, since it uses less digits than its factorization.

21044051020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404994 (or 404992 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 21044051020 its reverse (2015044012), we get a palindrome (23059095032).

The spelling of 21044051020 in words is "twenty-one billion, forty-four million, fifty-one thousand, twenty".