1221330402 has 12 divisors (see below), whose sum is σ = 2646215910. Its totient is φ = 407110128.

The previous prime is 1221330377. The next prime is 1221330413. The reversal of 1221330402 is 2040331221.

It can be written as a sum of positive squares in only one way, i.e., 1091575521 + 129754881 = 33039^2 + 11391^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 67851689 = 1221330402 / (1 + 2 + 2 + 1 + 3 + 3 + 0 + 4 + 0 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33925827 + ... + 33925862.

Almost surely, 2^1221330402 is an apocalyptic number.

1221330402 is an abundant number, since it is smaller than the sum of its proper divisors (1424885508).

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

1221330402 is a wasteful number, since it uses less digits than its factorization.

1221330402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67851697 (or 67851694 counting only the distinct ones).

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

The square root of 1221330402 is about 34947.5378531879. The cubic root of 1221330402 is about 1068.9179972701.

Adding to 1221330402 its reverse (2040331221), we get a palindrome (3261661623).

The spelling of 1221330402 in words is "one billion, two hundred twenty-one million, three hundred thirty thousand, four hundred two".