1231011321208 has 16 divisors (see below), whose sum is σ = 2314172724480. Its totient is φ = 613898594688.

The previous prime is 1231011321187. The next prime is 1231011321217. The reversal of 1231011321208 is 8021231101321.

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, 200879985 + ... + 200886112.

It is an arithmetic number, because the mean of its divisors is an integer number (144635795280).

Almost surely, 2^{1231011321208} is an apocalyptic number.

It is an amenable number.

1231011321208 is a deficient number, since it is larger than the sum of its proper divisors (1083161403272).

1231011321208 is a wasteful number, since it uses less digits than its factorization.

1231011321208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401766486 (or 401766482 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 1231011321208 its reverse (8021231101321), we get a palindrome (9252242422529).

The spelling of 1231011321208 in words is "one trillion, two hundred thirty-one billion, eleven million, three hundred twenty-one thousand, two hundred eight".