16721061 has 16 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 9433008.

The previous prime is 16721057. The next prime is 16721063. The reversal of 16721061 is 16012761.

It is not a de Polignac number, because 16721061 - 2² = 16721057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3381 + ... + 6698.

It is an arithmetic number, because the mean of its divisors is an integer number (1612800).

Almost surely, 2^16721061 is an apocalyptic number.

It is an amenable number.

16721061 is a deficient number, since it is larger than the sum of its proper divisors (9083739).

16721061 is a wasteful number, since it uses less digits than its factorization.

16721061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10168.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 16721061 is about 4089.1393960099. The cubic root of 16721061 is about 255.7140616411.

The spelling of 16721061 in words is "sixteen million, seven hundred twenty-one thousand, sixty-one".