21253236025235 has 4 divisors (see below), whose sum is σ = 25503883230288. Its totient is φ = 17002588820184.

The previous prime is 21253236025207. The next prime is 21253236025237. The reversal of 21253236025235 is 53252063235212.

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 21253236025235 - 2⁶ = 21253236025171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21253236025192 and 21253236025201.

It is not an unprimeable number, because it can be changed into a prime (21253236025237) 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, 2125323602519 + ... + 2125323602528.

It is an arithmetic number, because the mean of its divisors is an integer number (6375970807572).

Almost surely, 2^{21253236025235} is an apocalyptic number.

21253236025235 is a deficient number, since it is larger than the sum of its proper divisors (4250647205053).

21253236025235 is an equidigital number, since it uses as much as digits as its factorization.

21253236025235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250647205052.

The product of its (nonzero) digits is 648000, while the sum is 41.

The spelling of 21253236025235 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-six million, twenty-five thousand, two hundred thirty-five".