123412150021 has 4 divisors (see below), whose sum is σ = 123412854700. Its totient is φ = 123411445344.

The previous prime is 123412150013. The next prime is 123412150027. The reversal of 123412150021 is 120051214321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120051214321 = 50497 ⋅2377393.

It can be written as a sum of positive squares in 2 ways, for example, as 116734972225 + 6677177796 = 341665^2 + 81714^2 .

It is a cyclic number.

It is not a de Polignac number, because 123412150021 - 2³ = 123412150013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123412149974 and 123412150001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123412150027) 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, 135625 + ... + 514993.

It is an arithmetic number, because the mean of its divisors is an integer number (30853213675).

Almost surely, 2^123412150021 is an apocalyptic number.

It is an amenable number.

123412150021 is a deficient number, since it is larger than the sum of its proper divisors (704679).

123412150021 is an equidigital number, since it uses as much as digits as its factorization.

123412150021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704678.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 123412150021 its reverse (120051214321), we get a palindrome (243463364342).

The spelling of 123412150021 in words is "one hundred twenty-three billion, four hundred twelve million, one hundred fifty thousand, twenty-one".