1366233221 has 4 divisors (see below), whose sum is σ = 1371274944. Its totient is φ = 1361191500.

The previous prime is 1366233199. The next prime is 1366233233. The reversal of 1366233221 is 1223326631.

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 1366233221 - 2²² = 1362038917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366203221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2520455 + ... + 2520996.

It is an arithmetic number, because the mean of its divisors is an integer number (342818736).

Almost surely, 2^1366233221 is an apocalyptic number.

It is an amenable number.

1366233221 is a deficient number, since it is larger than the sum of its proper divisors (5041723).

1366233221 is an equidigital number, since it uses as much as digits as its factorization.

1366233221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041722.

The product of its digits is 7776, while the sum is 29.

The square root of 1366233221 is about 36962.5921845316. The cubic root of 1366233221 is about 1109.6217148317.

Adding to 1366233221 its reverse (1223326631), we get a palindrome (2589559852).

The spelling of 1366233221 in words is "one billion, three hundred sixty-six million, two hundred thirty-three thousand, two hundred twenty-one".