16721552 has 20 divisors (see below), whose sum is σ = 33807360. Its totient is φ = 7997088.

The previous prime is 16721479. The next prime is 16721569. The reversal of 16721552 is 25512761.

It is a super-2 number, since 2×16721552² = 559220602577408, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22352 + ... + 23087.

It is an arithmetic number, because the mean of its divisors is an integer number (1690368).

Almost surely, 2^16721552 is an apocalyptic number.

It is an amenable number.

16721552 is an abundant number, since it is smaller than the sum of its proper divisors (17085808).

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

16721552 is a wasteful number, since it uses less digits than its factorization.

16721552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45470 (or 45464 counting only the distinct ones).

The product of its digits is 4200, while the sum is 29.

The square root of 16721552 is about 4089.1994326518. The cubic root of 16721552 is about 255.7165645599.

The spelling of 16721552 in words is "sixteen million, seven hundred twenty-one thousand, five hundred fifty-two".