1231221133143 has 10 divisors (see below), whose sum is σ = 1839231569384. Its totient is φ = 820814088708.

The previous prime is 1231221133139. The next prime is 1231221133169. The reversal of 1231221133143 is 3413311221321.

1231221133143 is a `hidden beast` number, since 1 + 2 + 312 + 2 + 11 + 331 + 4 + 3 = 666.

It is not a de Polignac number, because 1231221133143 - 2² = 1231221133139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231221133133) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7600130371 + ... + 7600130532.

Almost surely, 2^{1231221133143} is an apocalyptic number.

1231221133143 is a deficient number, since it is larger than the sum of its proper divisors (608010436241).

1231221133143 is an equidigital number, since it uses as much as digits as its factorization.

1231221133143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15200260915 (or 15200260906 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 1231221133143 its reverse (3413311221321), we get a palindrome (4644532354464).

The spelling of 1231221133143 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-three thousand, one hundred forty-three".