21250251110423 has 4 divisors (see below), whose sum is σ = 21252719495280. Its totient is φ = 21247782725568.

The previous prime is 21250251110419. The next prime is 21250251110489. The reversal of 21250251110423 is 32401115205212.

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

It is a cyclic number.

It is not a de Polignac number, because 21250251110423 - 2² = 21250251110419 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 (21250251310423) 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, 1234179515 + ... + 1234196732.

It is an arithmetic number, because the mean of its divisors is an integer number (5313179873820).

Almost surely, 2^{21250251110423} is an apocalyptic number.

21250251110423 is a deficient number, since it is larger than the sum of its proper divisors (2468384857).

21250251110423 is an equidigital number, since it uses as much as digits as its factorization.

21250251110423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468384856.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 21250251110423 its reverse (32401115205212), we get a palindrome (53651366315635).

The spelling of 21250251110423 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-one million, one hundred ten thousand, four hundred twenty-three".