1212322231 has 4 divisors (see below), whose sum is σ = 1229397264. Its totient is φ = 1195247200.

The previous prime is 1212322213. The next prime is 1212322247. The reversal of 1212322231 is 1322232121.

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 1212322231 - 2⁷ = 1212322103 is a prime.

It is a super-2 number, since 2×1212322231² = 2939450383553634722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212322199 and 1212322208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212322201) 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 in 3 ways as a sum of consecutive naturals, for example, 8537410 + ... + 8537551.

It is an arithmetic number, because the mean of its divisors is an integer number (307349316).

Almost surely, 2^1212322231 is an apocalyptic number.

1212322231 is a deficient number, since it is larger than the sum of its proper divisors (17075033).

1212322231 is an equidigital number, since it uses as much as digits as its factorization.

1212322231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17075032.

The product of its digits is 288, while the sum is 19.

The square root of 1212322231 is about 34818.4179853135. The cubic root of 1212322231 is about 1066.2835021017.

Adding to 1212322231 its reverse (1322232121), we get a palindrome (2534554352).

The spelling of 1212322231 in words is "one billion, two hundred twelve million, three hundred twenty-two thousand, two hundred thirty-one".