1221003342 has 128 divisors (see below), whose sum is σ = 3127662720. Its totient is φ = 349747200.

The previous prime is 1221003341. The next prime is 1221003353. The reversal of 1221003342 is 2433001221.

It is a super-3 number, since 3×1221003342³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221003341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1204828 + ... + 1205840.

It is an arithmetic number, because the mean of its divisors is an integer number (24434865).

Almost surely, 2^1221003342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221003342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1563831360).

1221003342 is an abundant number, since it is smaller than the sum of its proper divisors (1906659378).

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

1221003342 is a wasteful number, since it uses less digits than its factorization.

1221003342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1149 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1221003342 is about 34942.8582402757. The cubic root of 1221003342 is about 1068.8225735882.

Adding to 1221003342 its reverse (2433001221), we get a palindrome (3654004563).

The spelling of 1221003342 in words is "one billion, two hundred twenty-one million, three thousand, three hundred forty-two".