1221333330 has 48 divisors (see below), whose sum is σ = 3409767360. Its totient is φ = 279161568.

The previous prime is 1221333307. The next prime is 1221333331. The reversal of 1221333330 is 333331221.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221333297 and 1221333306.

It is not an unprimeable number, because it can be changed into a prime (1221333331) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 413950 + ... + 416889.

It is an arithmetic number, because the mean of its divisors is an integer number (71036820).

Almost surely, 2^1221333330 is an apocalyptic number.

1221333330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221333330 is an abundant number, since it is smaller than the sum of its proper divisors (2188434030).

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

1221333330 is a wasteful number, since it uses less digits than its factorization.

1221333330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830863 (or 830856 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 21.

The square root of 1221333330 is about 34947.5797445259. The cubic root of 1221333330 is about 1068.9188514723.

Adding to 1221333330 its reverse (333331221), we get a palindrome (1554664551).

The spelling of 1221333330 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, three hundred thirty".