21013827863 has 8 divisors (see below), whose sum is σ = 24016787328. Its totient is φ = 18011114424.

The previous prime is 21013827851. The next prime is 21013827871. The reversal of 21013827863 is 36872831012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013827863 - 2¹⁸ = 21013565719 is a prime.

It is a super-2 number, since 2×21013827863² (a number of 21 digits) contains 22 as substring.

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 21013827863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013827563) 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, 190220 + ... + 279662.

It is an arithmetic number, because the mean of its divisors is an integer number (3002098416).

Almost surely, 2^21013827863 is an apocalyptic number.

21013827863 is a deficient number, since it is larger than the sum of its proper divisors (3002959465).

21013827863 is an equidigital number, since it uses as much as digits as its factorization.

21013827863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123013.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 21013827863 in words is "twenty-one billion, thirteen million, eight hundred twenty-seven thousand, eight hundred sixty-three".