21143302044 has 24 divisors (see below), whose sum is σ = 49665478800. Its totient is φ = 7000466304.

The previous prime is 21143302027. The next prime is 21143302073. The reversal of 21143302044 is 44020334112.

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, 5910769 + ... + 5914344.

It is an arithmetic number, because the mean of its divisors is an integer number (2069394950).

Almost surely, 2^21143302044 is an apocalyptic number.

It is an amenable number.

21143302044 is an abundant number, since it is smaller than the sum of its proper divisors (28522176756).

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

21143302044 is a wasteful number, since it uses less digits than its factorization.

21143302044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11825269 (or 11825267 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21143302044 its reverse (44020334112), we get a palindrome (65163636156).

The spelling of 21143302044 in words is "twenty-one billion, one hundred forty-three million, three hundred two thousand, forty-four".