12221610 has 32 divisors (see below), whose sum is σ = 29462400. Its totient is φ = 3244608.

The previous prime is 12221593. The next prime is 12221611. The reversal of 12221610 is 1612221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12221610.

It is not an unprimeable number, because it can be changed into a prime (12221611) 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, 7116 + ... + 8664.

It is an arithmetic number, because the mean of its divisors is an integer number (920700).

Almost surely, 2^12221610 is an apocalyptic number.

12221610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12221610 is an abundant number, since it is smaller than the sum of its proper divisors (17240790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221610 is a wasteful number, since it uses less digits than its factorization.

12221610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 12221610 is about 3495.9419331562. The cubic root of 12221610 is about 230.3435948319.

Adding to 12221610 its reverse (1612221), we get a palindrome (13833831).

The spelling of 12221610 in words is "twelve million, two hundred twenty-one thousand, six hundred ten".