1211212322143 has 4 divisors (see below), whose sum is σ = 1215346152888. Its totient is φ = 1207078491400.

The previous prime is 1211212322129. The next prime is 1211212322171. The reversal of 1211212322143 is 3412232121121.

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 1211212322143 - 2¹³ = 1211212313951 is a prime.

It is a super-2 number, since 2×1211212322143² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212322743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2066914933 + ... + 2066915518.

It is an arithmetic number, because the mean of its divisors is an integer number (303836538222).

Almost surely, 2^{1211212322143} is an apocalyptic number.

1211212322143 is a deficient number, since it is larger than the sum of its proper divisors (4133830745).

1211212322143 is an equidigital number, since it uses as much as digits as its factorization.

1211212322143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4133830744.

The product of its digits is 1152, while the sum is 25.

Adding to 1211212322143 its reverse (3412232121121), we get a palindrome (4623444443264).

The spelling of 1211212322143 in words is "one trillion, two hundred eleven billion, two hundred twelve million, three hundred twenty-two thousand, one hundred forty-three".