123102010021 has 4 divisors (see below), whose sum is σ = 129581063200. Its totient is φ = 116622956844.

The previous prime is 123102010007. The next prime is 123102010027. The reversal of 123102010021 is 120010201321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120010201321 = 41 ⋅2927078081.

It is a cyclic number.

It is not a de Polignac number, because 123102010021 - 2⁷ = 123102009893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123102009983 and 123102010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123102010027) 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, 3239526561 + ... + 3239526598.

It is an arithmetic number, because the mean of its divisors is an integer number (32395265800).

Almost surely, 2^123102010021 is an apocalyptic number.

It is an amenable number.

123102010021 is a deficient number, since it is larger than the sum of its proper divisors (6479053179).

123102010021 is an equidigital number, since it uses as much as digits as its factorization.

123102010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6479053178.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 123102010021 its reverse (120010201321), we get a palindrome (243112211342).

The spelling of 123102010021 in words is "one hundred twenty-three billion, one hundred two million, ten thousand, twenty-one".