12221090 has 40 divisors (see below), whose sum is σ = 25713180. Its totient is φ = 4181856.

The previous prime is 12221089. The next prime is 12221107. The reversal of 12221090 is 9012221.

It can be written as a sum of positive squares in 2 ways, for example, as 12103441 + 117649 = 3479^2 + 343^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23756 + ... + 24264.

Almost surely, 2^12221090 is an apocalyptic number.

12221090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12221090 is an abundant number, since it is smaller than the sum of its proper divisors (13492090).

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

12221090 is an frugal number, since it uses more digits than its factorization.

12221090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12221090 is about 3495.8675604204. The cubic root of 12221090 is about 230.3403279310.

It can be divided in two parts, 122 and 21090, that added together give a palindrome (21212).

The spelling of 12221090 in words is "twelve million, two hundred twenty-one thousand, ninety".