21275123043253 has 4 divisors (see below), whose sum is σ = 21364140294720. Its totient is φ = 21186105791788.

The previous prime is 21275123043247. The next prime is 21275123043277. The reversal of 21275123043253 is 35234032157212.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21275123043253 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 (21275123043953) 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, 44508625375 + ... + 44508625852.

It is an arithmetic number, because the mean of its divisors is an integer number (5341035073680).

Almost surely, 2^{21275123043253} is an apocalyptic number.

It is an amenable number.

21275123043253 is a deficient number, since it is larger than the sum of its proper divisors (89017251467).

21275123043253 is an equidigital number, since it uses as much as digits as its factorization.

21275123043253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89017251466.

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 21275123043253 in words is "twenty-one trillion, two hundred seventy-five billion, one hundred twenty-three million, forty-three thousand, two hundred fifty-three".