1211111324431 has 8 divisors (see below), whose sum is σ = 1213530794784. Its totient is φ = 1208693545440.

The previous prime is 1211111324413. The next prime is 1211111324441. The reversal of 1211111324431 is 1344231111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211111324431 - 2¹¹ = 1211111322383 is a prime.

It is a super-2 number, since 2×1211111324431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211111324396 and 1211111324405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111324441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1015581 + ... + 1858393.

It is an arithmetic number, because the mean of its divisors is an integer number (151691349348).

Almost surely, 2^{1211111324431} is an apocalyptic number.

1211111324431 is a deficient number, since it is larger than the sum of its proper divisors (2419470353).

1211111324431 is an equidigital number, since it uses as much as digits as its factorization.

1211111324431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845681.

The product of its digits is 576, while the sum is 25.

Adding to 1211111324431 its reverse (1344231111121), we get a palindrome (2555342435552).

The spelling of 1211111324431 in words is "one trillion, two hundred eleven billion, one hundred eleven million, three hundred twenty-four thousand, four hundred thirty-one".