210131123123 has 4 divisors (see below), whose sum is σ = 210136307568. Its totient is φ = 210125938680.

The previous prime is 210131123087. The next prime is 210131123149. The reversal of 210131123123 is 321321131012.

It is a happy number.

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 210131123123 - 2¹² = 210131119027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210131123095 and 210131123104.

It is not an unprimeable number, because it can be changed into a prime (210131123173) 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, 2530943 + ... + 2612648.

It is an arithmetic number, because the mean of its divisors is an integer number (52534076892).

Almost surely, 2^210131123123 is an apocalyptic number.

210131123123 is a deficient number, since it is larger than the sum of its proper divisors (5184445).

210131123123 is an equidigital number, since it uses as much as digits as its factorization.

210131123123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5184444.

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

Adding to 210131123123 its reverse (321321131012), we get a palindrome (531452254135).

The spelling of 210131123123 in words is "two hundred ten billion, one hundred thirty-one million, one hundred twenty-three thousand, one hundred twenty-three".