1111211203123 has 16 divisors (see below), whose sum is σ = 1273722494976. Its totient is φ = 949642341120.

The previous prime is 1111211203031. The next prime is 1111211203127. The reversal of 1111211203123 is 3213021121111.

It is a cyclic number.

It is not a de Polignac number, because 1111211203123 - 2²¹ = 1111209105971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111211203123.

It is not an unprimeable number, because it can be changed into a prime (1111211203127) 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 15 ways as a sum of consecutive naturals, for example, 21795940 + ... + 21846862.

It is an arithmetic number, because the mean of its divisors is an integer number (79607655936).

Almost surely, 2^{1111211203123} is an apocalyptic number.

1111211203123 is a deficient number, since it is larger than the sum of its proper divisors (162511291853).

1111211203123 is an equidigital number, since it uses as much as digits as its factorization.

1111211203123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60114.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1111211203123 its reverse (3213021121111), we get a palindrome (4324232324234).

The spelling of 1111211203123 in words is "one trillion, one hundred eleven billion, two hundred eleven million, two hundred three thousand, one hundred twenty-three".