1243221312 has 56 divisors (see below), whose sum is σ = 3378277216. Its totient is φ = 403204608.

The previous prime is 1243221307. The next prime is 1243221347. The reversal of 1243221312 is 2131223421.

It is a super-2 number, since 2×1243221312² = 3091198461222002688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80398 + ... + 94605.

Almost surely, 2^1243221312 is an apocalyptic number.

1243221312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1243221312 is an abundant number, since it is smaller than the sum of its proper divisors (2135055904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243221312 is a wasteful number, since it uses less digits than its factorization.

1243221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175055 (or 175045 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 1243221312 is about 35259.3436127220. The cubic root of 1243221312 is about 1075.2665823812.

Adding to 1243221312 its reverse (2131223421), we get a palindrome (3374444733).

The spelling of 1243221312 in words is "one billion, two hundred forty-three million, two hundred twenty-one thousand, three hundred twelve".