1211443042123 has 4 divisors (see below), whose sum is σ = 1282704397560. Its totient is φ = 1140181686688.

The previous prime is 1211443042097. The next prime is 1211443042153. The reversal of 1211443042123 is 3212403441121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211443042123 is a prime.

It is a super-3 number, since 3×1211443042123³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211443042091 and 1211443042100.

It is not an unprimeable number, because it can be changed into a prime (1211443042153) 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, 35630677693 + ... + 35630677726.

It is an arithmetic number, because the mean of its divisors is an integer number (320676099390).

Almost surely, 2^{1211443042123} is an apocalyptic number.

1211443042123 is a deficient number, since it is larger than the sum of its proper divisors (71261355437).

1211443042123 is an equidigital number, since it uses as much as digits as its factorization.

1211443042123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71261355436.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 1211443042123 its reverse (3212403441121), we get a palindrome (4423846483244).

The spelling of 1211443042123 in words is "one trillion, two hundred eleven billion, four hundred forty-three million, forty-two thousand, one hundred twenty-three".