16721301520 has 160 divisors (see below), whose sum is σ = 48574391040. Its totient is φ = 5200619520.

The previous prime is 16721301497. The next prime is 16721301523. The reversal of 16721301520 is 2510312761.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (16721301523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3132774 + ... + 3138106.

It is an arithmetic number, because the mean of its divisors is an integer number (303589944).

Almost surely, 2^16721301520 is an apocalyptic number.

16721301520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16721301520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24287195520).

16721301520 is an abundant number, since it is smaller than the sum of its proper divisors (31853089520).

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

16721301520 is a wasteful number, since it uses less digits than its factorization.

16721301520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5873 (or 5867 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 16721301520 in words is "sixteen billion, seven hundred twenty-one million, three hundred one thousand, five hundred twenty".