1221233412 has 48 divisors (see below), whose sum is σ = 3258429440. Its totient is φ = 348730272.

The previous prime is 1221233401. The next prime is 1221233501. The reversal of 1221233412 is 2143321221.

It is a super-2 number, since 2×1221233412² = 2982822093170323488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225723 + ... + 231069.

Almost surely, 2^1221233412 is an apocalyptic number.

1221233412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221233412 is an abundant number, since it is smaller than the sum of its proper divisors (2037196028).

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

1221233412 is a wasteful number, since it uses less digits than its factorization.

1221233412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8080 (or 8078 counting only the distinct ones).

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

The square root of 1221233412 is about 34946.1501742324. The cubic root of 1221233412 is about 1068.8897010502.

Adding to 1221233412 its reverse (2143321221), we get a palindrome (3364554633).

The spelling of 1221233412 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, four hundred twelve".