21016475136 has 240 divisors, whose sum is σ = 63441304080. Its totient is φ = 6954356736.

The previous prime is 21016475113. The next prime is 21016475171. The reversal of 21016475136 is 63157461012.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

21016475136 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 647 + 5 + 1 + 3 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21016475136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153404860 + ... + 153404996.

It is an arithmetic number, because the mean of its divisors is an integer number (264338767).

Almost surely, 2^21016475136 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 21016475136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31720652040).

21016475136 is an abundant number, since it is smaller than the sum of its proper divisors (42424828944).

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

21016475136 is an frugal number, since it uses more digits than its factorization.

21016475136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21016475136 in words is "twenty-one billion, sixteen million, four hundred seventy-five thousand, one hundred thirty-six".