16721045 has 16 divisors (see below), whose sum is σ = 23042880. Its totient is φ = 11520000.

The previous prime is 16721041. The next prime is 16721051. The reversal of 16721045 is 54012761.

It is not a de Polignac number, because 16721045 - 2² = 16721041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721041) 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, 6956 + ... + 9045.

It is an arithmetic number, because the mean of its divisors is an integer number (1440180).

Almost surely, 2^16721045 is an apocalyptic number.

It is an amenable number.

16721045 is a deficient number, since it is larger than the sum of its proper divisors (6321835).

16721045 is a wasteful number, since it uses less digits than its factorization.

16721045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16036.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 16721045 is about 4089.1374396075. The cubic root of 16721045 is about 255.7139800787.

It can be divided in two parts, 167 and 21045, that added together give a palindrome (21212).

The spelling of 16721045 in words is "sixteen million, seven hundred twenty-one thousand, forty-five".