1231213012 has 6 divisors (see below), whose sum is σ = 2154622778. Its totient is φ = 615606504.

The previous prime is 1231213007. The next prime is 1231213033. The reversal of 1231213012 is 2103121321.

It can be written as a sum of positive squares in only one way, i.e., 1024256016 + 206956996 = 32004^2 + 14386^2 .

It is a super-2 number, since 2×1231213012² = 3031770961836224288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153901623 + ... + 153901630.

Almost surely, 2^1231213012 is an apocalyptic number.

It is an amenable number.

1231213012 is a deficient number, since it is larger than the sum of its proper divisors (923409766).

1231213012 is a wasteful number, since it uses less digits than its factorization.

1231213012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307803257 (or 307803255 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1231213012 is about 35088.6450579101. The cubic root of 1231213012 is about 1071.7933683659.

Adding to 1231213012 its reverse (2103121321), we get a palindrome (3334334333).

The spelling of 1231213012 in words is "one billion, two hundred thirty-one million, two hundred thirteen thousand, twelve".