12201721 has 8 divisors (see below), whose sum is σ = 14425920. Its totient is φ = 10097808.

The previous prime is 12201719. The next prime is 12201737. The reversal of 12201721 is 12710221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12201721 - 2¹ = 12201719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201695 and 12201704.

It is not an unprimeable number, because it can be changed into a prime (12201821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29851 + ... + 30256.

It is an arithmetic number, because the mean of its divisors is an integer number (1803240).

Almost surely, 2^12201721 is an apocalyptic number.

It is an amenable number.

12201721 is a deficient number, since it is larger than the sum of its proper divisors (2224199).

12201721 is an equidigital number, since it uses as much as digits as its factorization.

12201721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60143.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 12201721 is about 3493.0961910603. The cubic root of 12201721 is about 230.2185760836.

Adding to 12201721 its reverse (12710221), we get a palindrome (24911942).

The spelling of 12201721 in words is "twelve million, two hundred one thousand, seven hundred twenty-one".