1224632221 has 4 divisors (see below), whose sum is σ = 1226491200. Its totient is φ = 1222773244.

The previous prime is 1224632191. The next prime is 1224632237. The reversal of 1224632221 is 1222364221.

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 1224632221 - 2⁷ = 1224632093 is a prime.

It is a super-2 number, since 2×1224632221² = 2999448153422785682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224632291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928501 + ... + 929818.

It is an arithmetic number, because the mean of its divisors is an integer number (306622800).

Almost surely, 2^1224632221 is an apocalyptic number.

It is an amenable number.

1224632221 is a deficient number, since it is larger than the sum of its proper divisors (1858979).

1224632221 is an equidigital number, since it uses as much as digits as its factorization.

1224632221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858978.

The product of its digits is 2304, while the sum is 25.

The square root of 1224632221 is about 34994.7456198784. The cubic root of 1224632221 is about 1069.8803898674.

Adding to 1224632221 its reverse (1222364221), we get a palindrome (2446996442).

The spelling of 1224632221 in words is "one billion, two hundred twenty-four million, six hundred thirty-two thousand, two hundred twenty-one".