1211031212123 has 16 divisors (see below), whose sum is σ = 1246067149536. Its totient is φ = 1176313286400.

The previous prime is 1211031212113. The next prime is 1211031212147. The reversal of 1211031212123 is 3212121301121.

It is a cyclic number.

It is not a de Polignac number, because 1211031212123 - 2⁶ = 1211031212059 is a prime.

It is a super-2 number, since 2×1211031212123² (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 = 1211031212095 and 1211031212104.

It is not an unprimeable number, because it can be changed into a prime (1211031212113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18714023 + ... + 18778623.

It is an arithmetic number, because the mean of its divisors is an integer number (77879196846).

Almost surely, 2^{1211031212123} is an apocalyptic number.

1211031212123 is a deficient number, since it is larger than the sum of its proper divisors (35035937413).

1211031212123 is a wasteful number, since it uses less digits than its factorization.

1211031212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67054.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1211031212123 its reverse (3212121301121), we get a palindrome (4423152513244).

The spelling of 1211031212123 in words is "one trillion, two hundred eleven billion, thirty-one million, two hundred twelve thousand, one hundred twenty-three".