1311221012 has 12 divisors (see below), whose sum is σ = 2368657536. Its totient is φ = 634461720.

The previous prime is 1311220979. The next prime is 1311221039. The reversal of 1311221012 is 2101221131.

It is a congruent number.

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, 5287058 + ... + 5287305.

It is an arithmetic number, because the mean of its divisors is an integer number (197388128).

Almost surely, 2^1311221012 is an apocalyptic number.

It is an amenable number.

1311221012 is a deficient number, since it is larger than the sum of its proper divisors (1057436524).

1311221012 is a wasteful number, since it uses less digits than its factorization.

1311221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10574398 (or 10574396 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1311221012 is about 36210.7858517321. The cubic root of 1311221012 is about 1094.5240279653.

Adding to 1311221012 its reverse (2101221131), we get a palindrome (3412442143).

The spelling of 1311221012 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, twelve".