16721155052 has 72 divisors (see below), whose sum is σ = 35685640704. Its totient is φ = 6714217728.

The previous prime is 16721155051. The next prime is 16721155097. The reversal of 16721155052 is 25055112761.

It is not an unprimeable number, because it can be changed into a prime (16721155051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1832333 + ... + 1841435.

Almost surely, 2^16721155052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16721155052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17842820352).

16721155052 is an abundant number, since it is smaller than the sum of its proper divisors (18964485652).

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

16721155052 is a wasteful number, since it uses less digits than its factorization.

16721155052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9375 (or 9356 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 16721155052 in words is "sixteen billion, seven hundred twenty-one million, one hundred fifty-five thousand, fifty-two".