1211143124231 has 4 divisors (see below), whose sum is σ = 1211150077464. Its totient is φ = 1211136171000.

The previous prime is 1211143124201. The next prime is 1211143124251. The reversal of 1211143124231 is 1324213411121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1211143124231 - 2⁶ = 1211143124167 is a prime.

It is a super-2 number, since 2×1211143124231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211143124231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211143124201) 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, 3208445 + ... + 3566006.

It is an arithmetic number, because the mean of its divisors is an integer number (302787519366).

Almost surely, 2^{1211143124231} is an apocalyptic number.

1211143124231 is a deficient number, since it is larger than the sum of its proper divisors (6953233).

1211143124231 is an equidigital number, since it uses as much as digits as its factorization.

1211143124231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6953232.

The product of its digits is 1152, while the sum is 26.

Adding to 1211143124231 its reverse (1324213411121), we get a palindrome (2535356535352).

The spelling of 1211143124231 in words is "one trillion, two hundred eleven billion, one hundred forty-three million, one hundred twenty-four thousand, two hundred thirty-one".