12221240 has 32 divisors (see below), whose sum is σ = 27622080. Its totient is φ = 4866432.

The previous prime is 12221233. The next prime is 12221243. The reversal of 12221240 is 4212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10529 + ... + 11631.

It is an arithmetic number, because the mean of its divisors is an integer number (863190).

Almost surely, 2^12221240 is an apocalyptic number.

12221240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221240 is an abundant number, since it is smaller than the sum of its proper divisors (15400840).

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

12221240 is a wasteful number, since it uses less digits than its factorization.

12221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391 (or 1387 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12221240 is about 3495.8890142566. The cubic root of 12221240 is about 230.3412703157.

Adding to 12221240 its reverse (4212221), we get a palindrome (16433461).

The spelling of 12221240 in words is "twelve million, two hundred twenty-one thousand, two hundred forty".