211131202123 has 4 divisors (see below), whose sum is σ = 211132258960. Its totient is φ = 211130145288.

The previous prime is 211131202097. The next prime is 211131202141. The reversal of 211131202123 is 321202131112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211131202123 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 211131202123.

It is not an unprimeable number, because it can be changed into a prime (211131205123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127215 + ... + 662152.

It is an arithmetic number, because the mean of its divisors is an integer number (52783064740).

Almost surely, 2^211131202123 is an apocalyptic number.

211131202123 is a deficient number, since it is larger than the sum of its proper divisors (1056837).

211131202123 is an equidigital number, since it uses as much as digits as its factorization.

211131202123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056836.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 211131202123 its reverse (321202131112), we get a palindrome (532333333235).

It can be divided in two parts, 21113 and 1202123, that added together give a square (1223236 = 1106²).

The spelling of 211131202123 in words is "two hundred eleven billion, one hundred thirty-one million, two hundred two thousand, one hundred twenty-three".