1311221201204 has 24 divisors (see below), whose sum is σ = 2333971523520. Its totient is φ = 644376406784.

The previous prime is 1311221201183. The next prime is 1311221201267. The reversal of 1311221201204 is 4021021221131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727652 + ... + 1775364.

It is an arithmetic number, because the mean of its divisors is an integer number (97248813480).

Almost surely, 2^{1311221201204} is an apocalyptic number.

It is an amenable number.

1311221201204 is a deficient number, since it is larger than the sum of its proper divisors (1022750322316).

1311221201204 is a wasteful number, since it uses less digits than its factorization.

1311221201204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053079 (or 1053077 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1311221201204 its reverse (4021021221131), we get a palindrome (5332242422335).

The spelling of 1311221201204 in words is "one trillion, three hundred eleven billion, two hundred twenty-one million, two hundred one thousand, two hundred four".