1221433320 has 32 divisors (see below), whose sum is σ = 3664300320. Its totient is φ = 325715520.

The previous prime is 1221433309. The next prime is 1221433327. The reversal of 1221433320 is 233341221.

1221433320 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1221433327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5089186 + ... + 5089425.

It is an arithmetic number, because the mean of its divisors is an integer number (114509385).

Almost surely, 2^1221433320 is an apocalyptic number.

1221433320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221433320 is an abundant number, since it is smaller than the sum of its proper divisors (2442867000).

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

1221433320 is a wasteful number, since it uses less digits than its factorization.

1221433320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10178625 (or 10178621 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 1221433320 is about 34949.0102864158. The cubic root of 1221433320 is about 1068.9480213085.

Adding to 1221433320 its reverse (233341221), we get a palindrome (1454774541).

The spelling of 1221433320 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, three hundred twenty".