21233540253 has 4 divisors (see below), whose sum is σ = 28311387008. Its totient is φ = 14155693500.

The previous prime is 21233540221. The next prime is 21233540261. The reversal of 21233540253 is 35204533212.

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 not a de Polignac number, because 21233540253 - 2⁵ = 21233540221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21233540253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233540213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3538923373 + ... + 3538923378.

It is an arithmetic number, because the mean of its divisors is an integer number (7077846752).

Almost surely, 2^21233540253 is an apocalyptic number.

It is an amenable number.

21233540253 is a deficient number, since it is larger than the sum of its proper divisors (7077846755).

21233540253 is an equidigital number, since it uses as much as digits as its factorization.

21233540253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077846754.

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 21233540253 in words is "twenty-one billion, two hundred thirty-three million, five hundred forty thousand, two hundred fifty-three".