12361221 has 16 divisors (see below), whose sum is σ = 18945600. Its totient is φ = 7956144.

The previous prime is 12361211. The next prime is 12361241. The reversal of 12361221 is 12216321.

12361221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12361221 - 2⁷ = 12361093 is a prime.

It is a super-2 number, since 2×12361221² = 305599569221682, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12361194 and 12361203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12361201) 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, 7111 + ... + 8676.

It is an arithmetic number, because the mean of its divisors is an integer number (1184100).

Almost surely, 2^12361221 is an apocalyptic number.

It is an amenable number.

12361221 is a deficient number, since it is larger than the sum of its proper divisors (6584379).

12361221 is a wasteful number, since it uses less digits than its factorization.

12361221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15825 (or 15819 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 12361221 is about 3515.8528126189. The cubic root of 12361221 is about 231.2173700247.

Adding to 12361221 its reverse (12216321), we get a palindrome (24577542).

The spelling of 12361221 in words is "twelve million, three hundred sixty-one thousand, two hundred twenty-one".