16721512144 has 20 divisors (see below), whose sum is σ = 32567558400. Its totient is φ = 8316980960.

The previous prime is 16721512139. The next prime is 16721512183. The reversal of 16721512144 is 44121512761.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2732794 + ... + 2738905.

It is an arithmetic number, because the mean of its divisors is an integer number (1628377920).

Almost surely, 2^16721512144 is an apocalyptic number.

It is an amenable number.

16721512144 is a deficient number, since it is larger than the sum of its proper divisors (15846046256).

16721512144 is a wasteful number, since it uses less digits than its factorization.

16721512144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471898 (or 5471892 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The spelling of 16721512144 in words is "sixteen billion, seven hundred twenty-one million, five hundred twelve thousand, one hundred forty-four".