1231223100101 has 4 divisors (see below), whose sum is σ = 1273679069100. Its totient is φ = 1188767131104.

The previous prime is 1231223100073. The next prime is 1231223100109. The reversal of 1231223100101 is 1010013221321.

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 588618856225 + 642604243876 = 767215^2 + 801626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231223100101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231223100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231223100109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21227984456 + ... + 21227984513.

It is an arithmetic number, because the mean of its divisors is an integer number (318419767275).

Almost surely, 2^{1231223100101} is an apocalyptic number.

It is an amenable number.

1231223100101 is a deficient number, since it is larger than the sum of its proper divisors (42455968999).

1231223100101 is an equidigital number, since it uses as much as digits as its factorization.

1231223100101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42455968998.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1231223100101 its reverse (1010013221321), we get a palindrome (2241236321422).

It can be divided in two parts, 123122 and 3100101, that added together give a palindrome (3223223).

The spelling of 1231223100101 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-three million, one hundred thousand, one hundred one".