16268721 has 32 divisors (see below), whose sum is σ = 25878528. Its totient is φ = 8898240.

The previous prime is 16268713. The next prime is 16268729. The reversal of 16268721 is 12786261.

It is an interprime number because it is at equal distance from previous prime (16268713) and next prime (16268729).

It is not a de Polignac number, because 16268721 - 2³ = 16268713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16268729) 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, 52156 + ... + 52466.

It is an arithmetic number, because the mean of its divisors is an integer number (808704).

Almost surely, 2^16268721 is an apocalyptic number.

It is an amenable number.

16268721 is a deficient number, since it is larger than the sum of its proper divisors (9609807).

16268721 is a wasteful number, since it uses less digits than its factorization.

16268721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its digits is 8064, while the sum is 33.

The square root of 16268721 is about 4033.4502600131. The cubic root of 16268721 is about 253.3870821243.

The spelling of 16268721 in words is "sixteen million, two hundred sixty-eight thousand, seven hundred twenty-one".