1211033312123 has 4 divisors (see below), whose sum is σ = 1228090119408. Its totient is φ = 1193976504840.

The previous prime is 1211033312113. The next prime is 1211033312129. The reversal of 1211033312123 is 3212133301121.

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 1211033312123 - 2⁴⁰ = 111521684347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211033312129) 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, 8528403536 + ... + 8528403677.

It is an arithmetic number, because the mean of its divisors is an integer number (307022529852).

Almost surely, 2^{1211033312123} is an apocalyptic number.

1211033312123 is a deficient number, since it is larger than the sum of its proper divisors (17056807285).

1211033312123 is an equidigital number, since it uses as much as digits as its factorization.

1211033312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17056807284.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1211033312123 its reverse (3212133301121), we get a palindrome (4423166613244).

The spelling of 1211033312123 in words is "one trillion, two hundred eleven billion, thirty-three million, three hundred twelve thousand, one hundred twenty-three".