1212211331 has 4 divisors (see below), whose sum is σ = 1213265664. Its totient is φ = 1211157000.

The previous prime is 1212211307. The next prime is 1212211373. The reversal of 1212211331 is 1331122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212211331 - 2¹⁸ = 1211949187 is a prime.

It is a super-2 number, since 2×1212211331² = 2938912622009583122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212211031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525440 + ... + 527741.

It is an arithmetic number, because the mean of its divisors is an integer number (303316416).

Almost surely, 2^1212211331 is an apocalyptic number.

1212211331 is a deficient number, since it is larger than the sum of its proper divisors (1054333).

1212211331 is a wasteful number, since it uses less digits than its factorization.

1212211331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054332.

The product of its digits is 72, while the sum is 17.

The square root of 1212211331 is about 34816.8254009466. The cubic root of 1212211331 is about 1066.2509875212.

Adding to 1212211331 its reverse (1331122121), we get a palindrome (2543333452).

The spelling of 1212211331 in words is "one billion, two hundred twelve million, two hundred eleven thousand, three hundred thirty-one".