1221332264 has 8 divisors (see below), whose sum is σ = 2289998010. Its totient is φ = 610666128.

The previous prime is 1221332263. The next prime is 1221332339. The reversal of 1221332264 is 4622331221.

It can be written as a sum of positive squares in only one way, i.e., 1170324100 + 51008164 = 34210^2 + 7142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1221332261) 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 as a sum of consecutive naturals, namely, 76333259 + ... + 76333274.

Almost surely, 2^1221332264 is an apocalyptic number.

It is an amenable number.

1221332264 is a deficient number, since it is larger than the sum of its proper divisors (1068665746).

1221332264 is a wasteful number, since it uses less digits than its factorization.

1221332264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152666539 (or 152666535 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 1221332264 is about 34947.5644931088. The cubic root of 1221332264 is about 1068.9185404822.

Adding to 1221332264 its reverse (4622331221), we get a palindrome (5843663485).

The spelling of 1221332264 in words is "one billion, two hundred twenty-one million, three hundred thirty-two thousand, two hundred sixty-four".