1211123203125 has 64 divisors (see below), whose sum is σ = 2202041237760. Its totient is φ = 587210000000.

The previous prime is 1211123203111. The next prime is 1211123203127. The reversal of 1211123203125 is 5213023211121.

It is not a de Polignac number, because 1211123203125 - 2¹³ = 1211123194933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211123203095 and 1211123203104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211123203127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2343241 + ... + 2813009.

It is an arithmetic number, because the mean of its divisors is an integer number (34406894340).

Almost surely, 2^{1211123203125} is an apocalyptic number.

1211123203125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211123203125 is a deficient number, since it is larger than the sum of its proper divisors (990918034635).

1211123203125 is an frugal number, since it uses more digits than its factorization.

1211123203125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469818 (or 469788 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 1211123203125 its reverse (5213023211121), we get a palindrome (6424146414246).

The spelling of 1211123203125 in words is "one trillion, two hundred eleven billion, one hundred twenty-three million, two hundred three thousand, one hundred twenty-five".