1221213332 has 6 divisors (see below), whose sum is σ = 2137123338. Its totient is φ = 610606664.

The previous prime is 1221213311. The next prime is 1221213337. The reversal of 1221213332 is 2333121221.

It can be written as a sum of positive squares in only one way, i.e., 1080173956 + 141039376 = 32866^2 + 11876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221213337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152651663 + ... + 152651670.

It is an arithmetic number, because the mean of its divisors is an integer number (356187223).

Almost surely, 2^1221213332 is an apocalyptic number.

It is an amenable number.

1221213332 is a deficient number, since it is larger than the sum of its proper divisors (915910006).

1221213332 is a wasteful number, since it uses less digits than its factorization.

1221213332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305303337 (or 305303335 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 1221213332 is about 34945.8628738796. The cubic root of 1221213332 is about 1068.8838426498.

Adding to 1221213332 its reverse (2333121221), we get a palindrome (3554334553).

The spelling of 1221213332 in words is "one billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred thirty-two".