12282721 has 16 divisors (see below), whose sum is σ = 14938560. Its totient is φ = 9953280.

The previous prime is 12282719. The next prime is 12282731. The reversal of 12282721 is 12728221.

It is a 5-Lehmer number, since φ(12282721) divides (12282721-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 12282721 - 2¹ = 12282719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12282701) 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, 1825 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^12282721 is an apocalyptic number.

12282721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12282721 is a deficient number, since it is larger than the sum of its proper divisors (2655839).

12282721 is a wasteful number, since it uses less digits than its factorization.

12282721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504.

The product of its digits is 896, while the sum is 25.

The square root of 12282721 is about 3504.6713112644. The cubic root of 12282721 is about 230.7268812230.

The spelling of 12282721 in words is "twelve million, two hundred eighty-two thousand, seven hundred twenty-one".