123110021 has 8 divisors (see below), whose sum is σ = 128980224. Its totient is φ = 117358560.

The previous prime is 123109927. The next prime is 123110033. The reversal of 123110021 is 120011321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123110021 - 2²² = 118915717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 123109984 and 123110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123110041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27560 + ... + 31713.

It is an arithmetic number, because the mean of its divisors is an integer number (16122528).

Almost surely, 2^123110021 is an apocalyptic number.

It is an amenable number.

123110021 is a deficient number, since it is larger than the sum of its proper divisors (5870203).

123110021 is an equidigital number, since it uses as much as digits as its factorization.

123110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59371.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 123110021 is about 11095.4955274652. The cubic root of 123110021 is about 497.4672197117.

Adding to 123110021 its reverse (120011321), we get a palindrome (243121342).

The spelling of 123110021 in words is "one hundred twenty-three million, one hundred ten thousand, twenty-one".