12721235 has 4 divisors (see below), whose sum is σ = 15265488. Its totient is φ = 10176984.

The previous prime is 12721217. The next prime is 12721271. The reversal of 12721235 is 53212721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12721235 - 2⁶ = 12721171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12721235.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1272119 + ... + 1272128.

It is an arithmetic number, because the mean of its divisors is an integer number (3816372).

Almost surely, 2^12721235 is an apocalyptic number.

12721235 is a deficient number, since it is larger than the sum of its proper divisors (2544253).

12721235 is an equidigital number, since it uses as much as digits as its factorization.

12721235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544252.

The product of its digits is 840, while the sum is 23.

The square root of 12721235 is about 3566.6840342256. The cubic root of 12721235 is about 233.4406184639.

Adding to 12721235 its reverse (53212721), we get a palindrome (65933956).

The spelling of 12721235 in words is "twelve million, seven hundred twenty-one thousand, two hundred thirty-five".