12265721 has 8 divisors (see below), whose sum is σ = 13986504. Its totient is φ = 10656000.

The previous prime is 12265717. The next prime is 12265727. The reversal of 12265721 is 12756221.

It can be written as a sum of positive squares in 4 ways, for example, as 3024121 + 9241600 = 1739^2 + 3040^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12265721 - 2² = 12265717 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12265727) 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, 27530 + ... + 27971.

It is an arithmetic number, because the mean of its divisors is an integer number (1748313).

Almost surely, 2^12265721 is an apocalyptic number.

It is an amenable number.

12265721 is a deficient number, since it is larger than the sum of its proper divisors (1720783).

12265721 is a wasteful number, since it uses less digits than its factorization.

12265721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55531.

The product of its digits is 1680, while the sum is 26.

The square root of 12265721 is about 3502.2451370514. The cubic root of 12265721 is about 230.6203856030.

The spelling of 12265721 in words is "twelve million, two hundred sixty-five thousand, seven hundred twenty-one".