1021231812 has 12 divisors (see below), whose sum is σ = 2382874256. Its totient is φ = 340410600.

The previous prime is 1021231801. The next prime is 1021231843. The reversal of 1021231812 is 2181321201.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42551314 + ... + 42551337.

Almost surely, 2^1021231812 is an apocalyptic number.

1021231812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021231812 is an abundant number, since it is smaller than the sum of its proper divisors (1361642444).

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

1021231812 is a wasteful number, since it uses less digits than its factorization.

1021231812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85102658 (or 85102656 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1021231812 is about 31956.7177914128. The cubic root of 1021231812 is about 1007.0277654798.

It can be divided in two parts, 10212 and 31812, that added together give a palindrome (42024).

The spelling of 1021231812 in words is "one billion, twenty-one million, two hundred thirty-one thousand, eight hundred twelve".