21204272144 has 40 divisors (see below), whose sum is σ = 45860418912. Its totient is φ = 9414155520.

The previous prime is 21204272143. The next prime is 21204272179. The reversal of 21204272144 is 44127240212.

It is not an unprimeable number, because it can be changed into a prime (21204272143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1393349 + ... + 1408484.

Almost surely, 2^21204272144 is an apocalyptic number.

It is an amenable number.

21204272144 is an abundant number, since it is smaller than the sum of its proper divisors (24656146768).

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

21204272144 is a wasteful number, since it uses less digits than its factorization.

21204272144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801895 (or 2801889 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The spelling of 21204272144 in words is "twenty-one billion, two hundred four million, two hundred seventy-two thousand, one hundred forty-four".