16721055 has 48 divisors (see below), whose sum is σ = 31633056. Its totient is φ = 8121600.

The previous prime is 16721051. The next prime is 16721057. The reversal of 16721055 is 55012761.

It is not a de Polignac number, because 16721055 - 2² = 16721051 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58944 + ... + 59226.

It is an arithmetic number, because the mean of its divisors is an integer number (659022).

Almost surely, 2^16721055 is an apocalyptic number.

16721055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16721055 is a deficient number, since it is larger than the sum of its proper divisors (14912001).

16721055 is a wasteful number, since it uses less digits than its factorization.

16721055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 16721055 is about 4089.1386623591. The cubic root of 16721055 is about 255.7140310552.

The spelling of 16721055 in words is "sixteen million, seven hundred twenty-one thousand, fifty-five".