1231021212 has 12 divisors (see below), whose sum is σ = 2872382856. Its totient is φ = 410340400.

The previous prime is 1231021201. The next prime is 1231021237. The reversal of 1231021212 is 2121201321.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1231021191 and 1231021200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51292539 + ... + 51292562.

It is an arithmetic number, because the mean of its divisors is an integer number (239365238).

Almost surely, 2^1231021212 is an apocalyptic number.

1231021212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231021212 is an abundant number, since it is smaller than the sum of its proper divisors (1641361644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231021212 is a wasteful number, since it uses less digits than its factorization.

1231021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102585108 (or 102585106 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1231021212 is about 35085.9118735711. The cubic root of 1231021212 is about 1071.7377103436.

Adding to 1231021212 its reverse (2121201321), we get a palindrome (3352222533).

The spelling of 1231021212 in words is "one billion, two hundred thirty-one million, twenty-one thousand, two hundred twelve".