1231020221103 has 12 divisors (see below), whose sum is σ = 1835499684928. Its totient is φ = 794206594080.

The previous prime is 1231020221017. The next prime is 1231020221129. The reversal of 1231020221103 is 3011220201321.

1231020221103 is a `hidden beast` number, since 12 + 310 + 20 + 221 + 103 = 666.

It is not a de Polignac number, because 1231020221103 - 2²⁶ = 1230953112239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231020221603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2206129150 + ... + 2206129707.

Almost surely, 2^{1231020221103} is an apocalyptic number.

1231020221103 is a deficient number, since it is larger than the sum of its proper divisors (604479463825).

1231020221103 is a wasteful number, since it uses less digits than its factorization.

1231020221103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4412258894 (or 4412258891 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1231020221103 its reverse (3011220201321), we get a palindrome (4242240422424).

The spelling of 1231020221103 in words is "one trillion, two hundred thirty-one billion, twenty million, two hundred twenty-one thousand, one hundred three".