12123254152021 has 4 divisors (see below), whose sum is σ = 12123332729100. Its totient is φ = 12123175574944.

The previous prime is 12123254152013. The next prime is 12123254152063. The reversal of 12123254152021 is 12025145232121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8442592716996 + 3680661435025 = 2905614^2 + 1918505^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123254152021 - 2³ = 12123254152013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123254152081) 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, 39056656 + ... + 39365833.

It is an arithmetic number, because the mean of its divisors is an integer number (3030833182275).

Almost surely, 2^{12123254152021} is an apocalyptic number.

It is an amenable number.

12123254152021 is a deficient number, since it is larger than the sum of its proper divisors (78577079).

12123254152021 is an equidigital number, since it uses as much as digits as its factorization.

12123254152021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78577078.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 12123254152021 its reverse (12025145232121), we get a palindrome (24148399384142).

The spelling of 12123254152021 in words is "twelve trillion, one hundred twenty-three billion, two hundred fifty-four million, one hundred fifty-two thousand, twenty-one".