21133044444 has 24 divisors (see below), whose sum is σ = 49366687888. Its totient is φ = 7036312320.

The previous prime is 21133044409. The next prime is 21133044461. The reversal of 21133044444 is 44444033112.

It is a congruent number.

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, 993517 + ... + 1014564.

Almost surely, 2^21133044444 is an apocalyptic number.

It is an amenable number.

21133044444 is an abundant number, since it is smaller than the sum of its proper divisors (28233643444).

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

21133044444 is a wasteful number, since it uses less digits than its factorization.

21133044444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008965 (or 2008963 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21133044444 its reverse (44444033112), we get a palindrome (65577077556).

The spelling of 21133044444 in words is "twenty-one billion, one hundred thirty-three million, forty-four thousand, four hundred forty-four".