21013022244 has 24 divisors (see below), whose sum is σ = 51914526048. Its totient is φ = 6592320640.

The previous prime is 21013022183. The next prime is 21013022273. The reversal of 21013022244 is 44222031012.

It is a self number, because there is not a number n which added to its sum of digits gives 21013022244.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51502302 + ... + 51502709.

It is an arithmetic number, because the mean of its divisors is an integer number (2163105252).

Almost surely, 2^21013022244 is an apocalyptic number.

It is an amenable number.

21013022244 is an abundant number, since it is smaller than the sum of its proper divisors (30901503804).

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

21013022244 is a wasteful number, since it uses less digits than its factorization.

21013022244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103005035 (or 103005033 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21013022244 its reverse (44222031012), we get a palindrome (65235053256).

The spelling of 21013022244 in words is "twenty-one billion, thirteen million, twenty-two thousand, two hundred forty-four".