21022003244 has 72 divisors (see below), whose sum is σ = 41203810704. Its totient is φ = 9375062400.

The previous prime is 21022003181. The next prime is 21022003333. The reversal of 21022003244 is 44230022012.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17329982 + ... + 17331194.

Almost surely, 2^21022003244 is an apocalyptic number.

It is an amenable number.

21022003244 is a deficient number, since it is larger than the sum of its proper divisors (20181807460).

21022003244 is a wasteful number, since it uses less digits than its factorization.

21022003244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887 (or 1874 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21022003244 its reverse (44230022012), we get a palindrome (65252025256).

The spelling of 21022003244 in words is "twenty-one billion, twenty-two million, three thousand, two hundred forty-four".