210231100123 has 4 divisors (see below), whose sum is σ = 229343018328. Its totient is φ = 191119181920.

The previous prime is 210231100109. The next prime is 210231100139. The reversal of 210231100123 is 321001132012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210231100123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210231100097 and 210231100106.

It is not an unprimeable number, because it can be changed into a prime (210231100153) 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, 9555959086 + ... + 9555959107.

It is an arithmetic number, because the mean of its divisors is an integer number (57335754582).

Almost surely, 2^210231100123 is an apocalyptic number.

210231100123 is a deficient number, since it is larger than the sum of its proper divisors (19111918205).

210231100123 is a wasteful number, since it uses less digits than its factorization.

210231100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19111918204.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 210231100123 its reverse (321001132012), we get a palindrome (531232232135).

The spelling of 210231100123 in words is "two hundred ten billion, two hundred thirty-one million, one hundred thousand, one hundred twenty-three".