21273044144 has 20 divisors (see below), whose sum is σ = 44963480040. Its totient is φ = 9669565440.

The previous prime is 21273044131. The next prime is 21273044183. The reversal of 21273044144 is 44144037212.

It is a self number, because there is not a number n which added to its sum of digits gives 21273044144.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60434609 + ... + 60434960.

It is an arithmetic number, because the mean of its divisors is an integer number (2248174002).

Almost surely, 2^21273044144 is an apocalyptic number.

It is an amenable number.

21273044144 is an abundant number, since it is smaller than the sum of its proper divisors (23690435896).

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

21273044144 is a wasteful number, since it uses less digits than its factorization.

21273044144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120869588 (or 120869582 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The spelling of 21273044144 in words is "twenty-one billion, two hundred seventy-three million, forty-four thousand, one hundred forty-four".