1221233120 has 48 divisors (see below), whose sum is σ = 2928251088. Its totient is φ = 481198080.

The previous prime is 1221233119. The next prime is 1221233161. The reversal of 1221233120 is 213321221.

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, 46241 + ... + 67680.

It is an arithmetic number, because the mean of its divisors is an integer number (61005231).

Almost surely, 2^1221233120 is an apocalyptic number.

1221233120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221233120 is an abundant number, since it is smaller than the sum of its proper divisors (1707017968).

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

1221233120 is a wasteful number, since it uses less digits than its factorization.

1221233120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114003 (or 113995 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221233120 is about 34946.1459963756. The cubic root of 1221233120 is about 1068.8896158588.

Adding to 1221233120 its reverse (213321221), we get a palindrome (1434554341).

The spelling of 1221233120 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, one hundred twenty".