12221351 has 16 divisors (see below), whose sum is σ = 13764960. Its totient is φ = 10782720.

The previous prime is 12221333. The next prime is 12221353. The reversal of 12221351 is 15312221.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221351 is a prime.

It is a super-2 number, since 2×12221351² = 298722840530402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221353) 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, 50591 + ... + 50831.

It is an arithmetic number, because the mean of its divisors is an integer number (860310).

Almost surely, 2^12221351 is an apocalyptic number.

12221351 is a deficient number, since it is larger than the sum of its proper divisors (1543609).

12221351 is a wasteful number, since it uses less digits than its factorization.

12221351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434.

The product of its digits is 120, while the sum is 17.

The square root of 12221351 is about 3495.9048900106. The cubic root of 12221351 is about 230.3419676755.

Adding to 12221351 its reverse (15312221), we get a palindrome (27533572).

The spelling of 12221351 in words is "twelve million, two hundred twenty-one thousand, three hundred fifty-one".