21027255853 has 8 divisors (see below), whose sum is σ = 21388305600. Its totient is φ = 20666361408.

The previous prime is 21027255827. The next prime is 21027255857. The reversal of 21027255853 is 35855272012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21027255853 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 (21027255857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252933 + ... + 325621.

It is an arithmetic number, because the mean of its divisors is an integer number (2673538200).

Almost surely, 2^21027255853 is an apocalyptic number.

It is an amenable number.

21027255853 is a deficient number, since it is larger than the sum of its proper divisors (361049747).

21027255853 is an equidigital number, since it uses as much as digits as its factorization.

21027255853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77651.

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 21027255853 in words is "twenty-one billion, twenty-seven million, two hundred fifty-five thousand, eight hundred fifty-three".