1231203233101 has 4 divisors (see below), whose sum is σ = 1231205967900. Its totient is φ = 1231200498304.

The previous prime is 1231203233089. The next prime is 1231203233159. The reversal of 1231203233101 is 1013323021321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 872120647876 + 359082585225 = 933874^2 + 599235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231203233101 - 2¹¹ = 1231203231053 is a prime.

It is a super-2 number, since 2×1231203233101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231203233171) 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 3 ways as a sum of consecutive naturals, for example, 514966 + ... + 1651543.

It is an arithmetic number, because the mean of its divisors is an integer number (307801491975).

Almost surely, 2^{1231203233101} is an apocalyptic number.

It is an amenable number.

1231203233101 is a deficient number, since it is larger than the sum of its proper divisors (2734799).

1231203233101 is an equidigital number, since it uses as much as digits as its factorization.

1231203233101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734798.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1231203233101 its reverse (1013323021321), we get a palindrome (2244526254422).

The spelling of 1231203233101 in words is "one trillion, two hundred thirty-one billion, two hundred three million, two hundred thirty-three thousand, one hundred one".