12221377 has 4 divisors (see below), whose sum is σ = 13967296. Its totient is φ = 10475460.

The previous prime is 12221371. The next prime is 12221393. The reversal of 12221377 is 77312221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12221377 - 2³ = 12221369 is a prime.

It is a super-2 number, since 2×12221377² = 298724111552258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12221371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872949 + ... + 872962.

It is an arithmetic number, because the mean of its divisors is an integer number (3491824).

Almost surely, 2^12221377 is an apocalyptic number.

It is an amenable number.

12221377 is a deficient number, since it is larger than the sum of its proper divisors (1745919).

12221377 is an equidigital number, since it uses as much as digits as its factorization.

12221377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745918.

The product of its digits is 1176, while the sum is 25.

The square root of 12221377 is about 3495.9086086453. The cubic root of 12221377 is about 230.3421310204.

Adding to 12221377 its reverse (77312221), we get a palindrome (89533598).

The spelling of 12221377 in words is "twelve million, two hundred twenty-one thousand, three hundred seventy-seven".