1211231123201 has 16 divisors (see below), whose sum is σ = 1324754870400. Its totient is φ = 1098276758400.

The previous prime is 1211231123171. The next prime is 1211231123239. The reversal of 1211231123201 is 1023211321121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211231123201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211231125201) 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, 45251060 + ... + 45277818.

It is an arithmetic number, because the mean of its divisors is an integer number (82797179400).

Almost surely, 2^{1211231123201} is an apocalyptic number.

1211231123201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211231123201 is a deficient number, since it is larger than the sum of its proper divisors (113523747199).

1211231123201 is a wasteful number, since it uses less digits than its factorization.

1211231123201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37240.

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

Adding to 1211231123201 its reverse (1023211321121), we get a palindrome (2234442444322).

The spelling of 1211231123201 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, one hundred twenty-three thousand, two hundred one".