1212221331 has 24 divisors (see below), whose sum is σ = 1762553520. Its totient is φ = 802829376.

The previous prime is 1212221327. The next prime is 1212221333. The reversal of 1212221331 is 1331222121.

It is not a de Polignac number, because 1212221331 - 2² = 1212221327 is a prime.

It is a super-2 number, since 2×1212221331² = 2938961110662823122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212221333) 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 in 23 ways as a sum of consecutive naturals, for example, 1420701 + ... + 1421553.

It is an arithmetic number, because the mean of its divisors is an integer number (73439730).

Almost surely, 2^1212221331 is an apocalyptic number.

1212221331 is a deficient number, since it is larger than the sum of its proper divisors (550332189).

1212221331 is a wasteful number, since it uses less digits than its factorization.

1212221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 1712 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1212221331 is about 34816.9690093782. The cubic root of 1212221331 is about 1066.2539194854.

Adding to 1212221331 its reverse (1331222121), we get a palindrome (2543443452).

The spelling of 1212221331 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, three hundred thirty-one".