210131323123 has 4 divisors (see below), whose sum is σ = 211010533920. Its totient is φ = 209252112328.

The previous prime is 210131323121. The next prime is 210131323141. The reversal of 210131323123 is 321323131012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 210131323123 - 2¹ = 210131323121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210131323094 and 210131323103.

It is not an unprimeable number, because it can be changed into a prime (210131323121) 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, 439605040 + ... + 439605517.

It is an arithmetic number, because the mean of its divisors is an integer number (52752633480).

Almost surely, 2^210131323123 is an apocalyptic number.

210131323123 is a deficient number, since it is larger than the sum of its proper divisors (879210797).

210131323123 is an equidigital number, since it uses as much as digits as its factorization.

210131323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879210796.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 210131323123 its reverse (321323131012), we get a palindrome (531454454135).

The spelling of 210131323123 in words is "two hundred ten billion, one hundred thirty-one million, three hundred twenty-three thousand, one hundred twenty-three".