21042272944 has 40 divisors (see below), whose sum is σ = 50829389568. Its totient is φ = 8198287680.

The previous prime is 21042272939. The next prime is 21042272957. The reversal of 21042272944 is 44927224012.

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, 8538652 + ... + 8541115.

Almost surely, 2^21042272944 is an apocalyptic number.

It is an amenable number.

21042272944 is an abundant number, since it is smaller than the sum of its proper divisors (29787116624).

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

21042272944 is a wasteful number, since it uses less digits than its factorization.

21042272944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17079793 (or 17079787 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

Adding to 21042272944 its reverse (44927224012), we get a palindrome (65969496956).

The spelling of 21042272944 in words is "twenty-one billion, forty-two million, two hundred seventy-two thousand, nine hundred forty-four".