21385110852 has 144 divisors (see below), whose sum is σ = 63009553152. Its totient is φ = 5989386240.

The previous prime is 21385110833. The next prime is 21385110961. The reversal of 21385110852 is 25801158312.

21385110852 is a `hidden beast` number, since 2 + 138 + 511 + 0 + 8 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3068652 + ... + 3075612.

Almost surely, 2^21385110852 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21385110852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31504776576).

21385110852 is an abundant number, since it is smaller than the sum of its proper divisors (41624442300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21385110852 is a wasteful number, since it uses less digits than its factorization.

21385110852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7218 (or 7213 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 21385110852 in words is "twenty-one billion, three hundred eighty-five million, one hundred ten thousand, eight hundred fifty-two".