1221232243 has 12 divisors (see below), whose sum is σ = 1549764792. Its totient is φ = 951609120.

The previous prime is 1221232241. The next prime is 1221232283. The reversal of 1221232243 is 3422321221.

It is not a de Polignac number, because 1221232243 - 2¹ = 1221232241 is a prime.

It is a super-2 number, since 2×1221232243² = 2982816382685622098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221232241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1132330 + ... + 1133407.

It is an arithmetic number, because the mean of its divisors is an integer number (129147066).

Almost surely, 2^1221232243 is an apocalyptic number.

1221232243 is a deficient number, since it is larger than the sum of its proper divisors (328532549).

1221232243 is a wasteful number, since it uses less digits than its factorization.

1221232243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265762 (or 2265755 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 1221232243 is about 34946.1334484947. The cubic root of 1221232243 is about 1068.8893599927.

Adding to 1221232243 its reverse (3422321221), we get a palindrome (4643553464).

The spelling of 1221232243 in words is "one billion, two hundred twenty-one million, two hundred thirty-two thousand, two hundred forty-three".