1231101220143 has 16 divisors (see below), whose sum is σ = 1661486077440. Its totient is φ = 810728124864.

The previous prime is 1231101220133. The next prime is 1231101220147. The reversal of 1231101220143 is 3410221011321.

It is not a de Polignac number, because 1231101220143 - 2⁹ = 1231101219631 is a prime.

It is a super-2 number, since 2×1231101220143² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231101220147) 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, 1377555 + ... + 2088027.

It is an arithmetic number, because the mean of its divisors is an integer number (103842879840).

Almost surely, 2^{1231101220143} is an apocalyptic number.

1231101220143 is a deficient number, since it is larger than the sum of its proper divisors (430384857297).

1231101220143 is an equidigital number, since it uses as much as digits as its factorization.

1231101220143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717518.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1231101220143 its reverse (3410221011321), we get a palindrome (4641322231464).

The spelling of 1231101220143 in words is "one trillion, two hundred thirty-one billion, one hundred one million, two hundred twenty thousand, one hundred forty-three".