1211231001101 has 4 divisors (see below), whose sum is σ = 1321342910304. Its totient is φ = 1101119091900.

The previous prime is 1211231001077. The next prime is 1211231001109. The reversal of 1211231001101 is 1011001321121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211231001101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211231001109) 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 3 ways as a sum of consecutive naturals, for example, 55055954585 + ... + 55055954606.

It is an arithmetic number, because the mean of its divisors is an integer number (330335727576).

Almost surely, 2^{1211231001101} is an apocalyptic number.

1211231001101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211231001101 is a deficient number, since it is larger than the sum of its proper divisors (110111909203).

1211231001101 is a wasteful number, since it uses less digits than its factorization.

1211231001101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110111909202.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1211231001101 its reverse (1011001321121), we get a palindrome (2222232322222).

The spelling of 1211231001101 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, one thousand, one hundred one".