1212221233 has 4 divisors (see below), whose sum is σ = 1264926528. Its totient is φ = 1159515940.

The previous prime is 1212221221. The next prime is 1212221243. The reversal of 1212221233 is 3321222121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3321222121 = 7 ⋅474460303.

It is a cyclic number.

It is not a de Polignac number, because 1212221233 - 2²¹ = 1210124081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212221233.

It is not an unprimeable number, because it can be changed into a prime (1212221243) 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, 26352613 + ... + 26352658.

It is an arithmetic number, because the mean of its divisors is an integer number (316231632).

Almost surely, 2^1212221233 is an apocalyptic number.

It is an amenable number.

1212221233 is a deficient number, since it is larger than the sum of its proper divisors (52705295).

1212221233 is an equidigital number, since it uses as much as digits as its factorization.

1212221233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52705294.

The product of its digits is 288, while the sum is 19.

The square root of 1212221233 is about 34816.9676020184. The cubic root of 1212221233 is about 1066.2538907522.

Adding to 1212221233 its reverse (3321222121), we get a palindrome (4533443354).

The spelling of 1212221233 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred thirty-three".