1221303272 has 32 divisors (see below), whose sum is σ = 2672766720. Its totient is φ = 512278080.

The previous prime is 1221303271. The next prime is 1221303277. The reversal of 1221303272 is 2723031221.

It is not an unprimeable number, because it can be changed into a prime (1221303271) 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, 229379 + ... + 234642.

It is an arithmetic number, because the mean of its divisors is an integer number (83523960).

Almost surely, 2^1221303272 is an apocalyptic number.

It is an amenable number.

1221303272 is an abundant number, since it is smaller than the sum of its proper divisors (1451463448).

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

1221303272 is a wasteful number, since it uses less digits than its factorization.

1221303272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464081 (or 464077 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1221303272 is about 34947.1496977937. The cubic root of 1221303272 is about 1068.9100824149.

Adding to 1221303272 its reverse (2723031221), we get a palindrome (3944334493).

The spelling of 1221303272 in words is "one billion, two hundred twenty-one million, three hundred three thousand, two hundred seventy-two".