12221745 has 8 divisors (see below), whose sum is σ = 19554816. Its totient is φ = 6518256.

The previous prime is 12221689. The next prime is 12221749. The reversal of 12221745 is 54712221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12221745 - 2⁶ = 12221681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221749) 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, 407377 + ... + 407406.

It is an arithmetic number, because the mean of its divisors is an integer number (2444352).

Almost surely, 2^12221745 is an apocalyptic number.

12221745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12221745 is a deficient number, since it is larger than the sum of its proper divisors (7333071).

12221745 is an equidigital number, since it uses as much as digits as its factorization.

12221745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814791.

The product of its digits is 1120, while the sum is 24.

The square root of 12221745 is about 3495.9612412039. The cubic root of 12221745 is about 230.3444429545.

Adding to 12221745 its reverse (54712221), we get a palindrome (66933966).

The spelling of 12221745 in words is "twelve million, two hundred twenty-one thousand, seven hundred forty-five".