1221122243 has 4 divisors (see below), whose sum is σ = 1332133368. Its totient is φ = 1110111120.

The previous prime is 1221122239. The next prime is 1221122281. The reversal of 1221122243 is 3422211221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221122243 - 2² = 1221122239 is a prime.

It is a super-2 number, since 2×1221122243² = 2982279064698702098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221122543) 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, 55505546 + ... + 55505567.

It is an arithmetic number, because the mean of its divisors is an integer number (333033342).

Almost surely, 2^1221122243 is an apocalyptic number.

1221122243 is a deficient number, since it is larger than the sum of its proper divisors (111011125).

1221122243 is a wasteful number, since it uses less digits than its factorization.

1221122243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111011124.

The product of its digits is 384, while the sum is 20.

The square root of 1221122243 is about 34944.5595622552. The cubic root of 1221122243 is about 1068.8572663538.

Adding to 1221122243 its reverse (3422211221), we get a palindrome (4643333464).

The spelling of 1221122243 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred forty-three".