14921721 has 12 divisors (see below), whose sum is σ = 21588372. Its totient is φ = 9931776.

The previous prime is 14921719. The next prime is 14921723. The reversal of 14921721 is 12712941.

14921721 is a `hidden beast` number, since 1 + 492 + 172 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (14921719) and next prime (14921723).

It can be written as a sum of positive squares in 2 ways, for example, as 14175225 + 746496 = 3765^2 + 864^2 .

It is not a de Polignac number, because 14921721 - 2¹ = 14921719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (14921723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7945 + ... + 9641.

It is an arithmetic number, because the mean of its divisors is an integer number (1799031).

Almost surely, 2^14921721 is an apocalyptic number.

It is an amenable number.

14921721 is a deficient number, since it is larger than the sum of its proper divisors (6666651).

14921721 is a wasteful number, since it uses less digits than its factorization.

14921721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680 (or 2677 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 14921721 is about 3862.8643517473. The cubic root of 14921721 is about 246.1914531809.

The spelling of 14921721 in words is "fourteen million, nine hundred twenty-one thousand, seven hundred twenty-one".