14156721 has 16 divisors (see below), whose sum is σ = 21241600. Its totient is φ = 9316944.

The previous prime is 14156719. The next prime is 14156741. The reversal of 14156721 is 12765141.

It is a happy number.

It is not a de Polignac number, because 14156721 - 2¹ = 14156719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (14156741) 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, 1186 + ... + 5451.

It is an arithmetic number, because the mean of its divisors is an integer number (1327600).

Almost surely, 2^14156721 is an apocalyptic number.

It is an amenable number.

14156721 is a deficient number, since it is larger than the sum of its proper divisors (7084879).

14156721 is an equidigital number, since it uses as much as digits as its factorization.

14156721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6725 (or 6719 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 14156721 is about 3762.5418270100. The cubic root of 14156721 is about 241.9102244235.

The spelling of 14156721 in words is "fourteen million, one hundred fifty-six thousand, seven hundred twenty-one".