14721021 has 30 divisors (see below), whose sum is σ = 25587870. Its totient is φ = 8409744.

The previous prime is 14721013. The next prime is 14721037. The reversal of 14721021 is 12012741.

It can be written as a sum of positive squares in only one way, i.e., 11148921 + 3572100 = 3339^2 + 1890^2 .

It is not a de Polignac number, because 14721021 - 2³ = 14721013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 14720985 and 14721003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14721041) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2115 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (852929).

Almost surely, 2^14721021 is an apocalyptic number.

It is an amenable number.

14721021 is a deficient number, since it is larger than the sum of its proper divisors (10866849).

14721021 is an equidigital number, since it uses as much as digits as its factorization.

14721021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735 (or 3719 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 14721021 is about 3836.7982746034. The cubic root of 14721021 is about 245.0826931744.

Adding to 14721021 its reverse (12012741), we get a palindrome (26733762).

The spelling of 14721021 in words is "fourteen million, seven hundred twenty-one thousand, twenty-one".