12221457 has 8 divisors (see below), whose sum is σ = 16642176. Its totient is φ = 7974192.

The previous prime is 12221449. The next prime is 12221459. The reversal of 12221457 is 75412221.

12221457 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12221457 - 2³ = 12221449 is a prime.

It is a super-2 number, since 2×12221457² = 298728022405698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12221459) 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, 43198 + ... + 43479.

It is an arithmetic number, because the mean of its divisors is an integer number (2080272).

Almost surely, 2^12221457 is an apocalyptic number.

It is an amenable number.

12221457 is a deficient number, since it is larger than the sum of its proper divisors (4420719).

12221457 is an equidigital number, since it uses as much as digits as its factorization.

12221457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86727.

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

The square root of 12221457 is about 3495.9200505732. The cubic root of 12221457 is about 230.3426336188.

Adding to 12221457 its reverse (75412221), we get a palindrome (87633678).

The spelling of 12221457 in words is "twelve million, two hundred twenty-one thousand, four hundred fifty-seven".