1231240243101 has 16 divisors (see below), whose sum is σ = 1896241658688. Its totient is φ = 702311724800.

The previous prime is 1231240243061. The next prime is 1231240243111. The reversal of 1231240243101 is 1013420421321.

It is not a de Polignac number, because 1231240243101 - 2¹⁷ = 1231240112029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231240243111) 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 15 ways as a sum of consecutive naturals, for example, 1097361510 + ... + 1097362631.

It is an arithmetic number, because the mean of its divisors is an integer number (118515103668).

Almost surely, 2^{1231240243101} is an apocalyptic number.

1231240243101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231240243101 is a deficient number, since it is larger than the sum of its proper divisors (665001415587).

1231240243101 is a wasteful number, since it uses less digits than its factorization.

1231240243101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194724172.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 1231240243101 its reverse (1013420421321), we get a palindrome (2244660664422).

The spelling of 1231240243101 in words is "one trillion, two hundred thirty-one billion, two hundred forty million, two hundred forty-three thousand, one hundred one".