13612221 has 24 divisors (see below), whose sum is σ = 22568000. Its totient is φ = 7744896.

The previous prime is 13612201. The next prime is 13612229. The reversal of 13612221 is 12221631.

It is not a de Polignac number, because 13612221 - 2⁹ = 13611709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13612194 and 13612203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13612229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27030 + ... + 27528.

Almost surely, 2^13612221 is an apocalyptic number.

It is an amenable number.

13612221 is a deficient number, since it is larger than the sum of its proper divisors (8955779).

13612221 is a wasteful number, since it uses less digits than its factorization.

13612221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945 (or 942 counting only the distinct ones).

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

The square root of 13612221 is about 3689.4743528042. The cubic root of 13612221 is about 238.7681148139.

Adding to 13612221 its reverse (12221631), we get a palindrome (25833852).

The spelling of 13612221 in words is "thirteen million, six hundred twelve thousand, two hundred twenty-one".