1221320233 has 8 divisors (see below), whose sum is σ = 1399021568. Its totient is φ = 1044425664.

The previous prime is 1221320227. The next prime is 1221320251. The reversal of 1221320233 is 3320231221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221320233 - 2²¹ = 1219223081 is a prime.

It is a super-2 number, since 2×1221320233² = 2983246223070348578, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221320233.

It is not an unprimeable number, because it can be changed into a prime (1221320293) 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, 198441 + ... + 204502.

It is an arithmetic number, because the mean of its divisors is an integer number (174877696).

Almost surely, 2^1221320233 is an apocalyptic number.

It is an amenable number.

1221320233 is a deficient number, since it is larger than the sum of its proper divisors (177701335).

1221320233 is an equidigital number, since it uses as much as digits as its factorization.

1221320233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403383.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1221320233 is about 34947.3923633796. The cubic root of 1221320233 is about 1068.9150305989.

Adding to 1221320233 its reverse (3320231221), we get a palindrome (4541551454).

The spelling of 1221320233 in words is "one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred thirty-three".