1231213020 has 48 divisors (see below), whose sum is σ = 3503921568. Its totient is φ = 322940160.

The previous prime is 1231213007. The next prime is 1231213033. The reversal of 1231213020 is 203121321.

It is an interprime number because it is at equal distance from previous prime (1231213007) and next prime (1231213033).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164539 + ... + 171858.

It is an arithmetic number, because the mean of its divisors is an integer number (72998366).

Almost surely, 2^1231213020 is an apocalyptic number.

1231213020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231213020 is an abundant number, since it is smaller than the sum of its proper divisors (2272708548).

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

1231213020 is a wasteful number, since it uses less digits than its factorization.

1231213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336470 (or 336468 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231213020 is about 35088.6451719071. The cubic root of 1231213020 is about 1071.7933706872.

Adding to 1231213020 its reverse (203121321), we get a palindrome (1434334341).

The spelling of 1231213020 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, twenty".