21066364116 has 96 divisors (see below), whose sum is σ = 62496725760. Its totient is φ = 6011452800.

The previous prime is 21066364093. The next prime is 21066364127. The reversal of 21066364116 is 61146366012.

It is a happy number.

21066364116 is a `hidden beast` number, since 2 + 1 + 0 + 6 + 6 + 3 + 641 + 1 + 6 = 666.

It is a super-2 number, since 2×21066364116² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 603706 + ... + 637646.

It is an arithmetic number, because the mean of its divisors is an integer number (651007560).

Almost surely, 2^21066364116 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 21066364116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31248362880).

21066364116 is an abundant number, since it is smaller than the sum of its proper divisors (41430361644).

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

21066364116 is a wasteful number, since it uses less digits than its factorization.

21066364116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34782 (or 34774 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 21066364116 in words is "twenty-one billion, sixty-six million, three hundred sixty-four thousand, one hundred sixteen".