21250524233 has 4 divisors (see below), whose sum is σ = 21305153220. Its totient is φ = 21195895248.

The previous prime is 21250524223. The next prime is 21250524247. The reversal of 21250524233 is 33242505212.

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 2742826384 + 18507697849 = 52372^2 + 136043^2 .

It is a cyclic number.

It is not a de Polignac number, because 21250524233 - 2¹⁴ = 21250507849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21250524196 and 21250524205.

It is not an unprimeable number, because it can be changed into a prime (21250524223) 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, 27313910 + ... + 27314687.

It is an arithmetic number, because the mean of its divisors is an integer number (5326288305).

Almost surely, 2^21250524233 is an apocalyptic number.

It is an amenable number.

21250524233 is a deficient number, since it is larger than the sum of its proper divisors (54628987).

21250524233 is an equidigital number, since it uses as much as digits as its factorization.

21250524233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54628986.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 21250524233 in words is "twenty-one billion, two hundred fifty million, five hundred twenty-four thousand, two hundred thirty-three".