211123023131 has 12 divisors (see below), whose sum is σ = 218747922336. Its totient is φ = 203755552560.

The previous prime is 211123023119. The next prime is 211123023203. The reversal of 211123023131 is 131320321112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-211123023131 is a prime.

It is a super-2 number, since 2×211123023131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211123023101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53381 + ... + 651993.

It is an arithmetic number, because the mean of its divisors is an integer number (18228993528).

Almost surely, 2^211123023131 is an apocalyptic number.

211123023131 is a deficient number, since it is larger than the sum of its proper divisors (7624899205).

211123023131 is an equidigital number, since it uses as much as digits as its factorization.

211123023131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599042 (or 599011 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 211123023131 its reverse (131320321112), we get a palindrome (342443344243).

The spelling of 211123023131 in words is "two hundred eleven billion, one hundred twenty-three million, twenty-three thousand, one hundred thirty-one".