21187482853 has 8 divisors (see below), whose sum is σ = 21983134680. Its totient is φ = 20396167680.

The previous prime is 21187482847. The next prime is 21187482871. The reversal of 21187482853 is 35828478112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6951890884 + 14235591969 = 83378^2 + 119313^2 .

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 21187482853 - 2²⁹ = 20650611941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21187482797 and 21187482806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21187482553) 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, 1074208 + ... + 1093753.

It is an arithmetic number, because the mean of its divisors is an integer number (2747891835).

Almost surely, 2^21187482853 is an apocalyptic number.

It is an amenable number.

21187482853 is a deficient number, since it is larger than the sum of its proper divisors (795651827).

21187482853 is a wasteful number, since it uses less digits than its factorization.

21187482853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168327.

The product of its digits is 860160, while the sum is 49.

The spelling of 21187482853 in words is "twenty-one billion, one hundred eighty-seven million, four hundred eighty-two thousand, eight hundred fifty-three".