21064039116 has 24 divisors (see below), whose sum is σ = 49177133040. Its totient is φ = 7017388032.

The previous prime is 21064039109. The next prime is 21064039121. The reversal of 21064039116 is 61193046012.

It is a super-2 number, since 2×21064039116² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 472581 + ... + 515228.

It is an arithmetic number, because the mean of its divisors is an integer number (2049047210).

Almost surely, 2^21064039116 is an apocalyptic number.

It is an amenable number.

21064039116 is an abundant number, since it is smaller than the sum of its proper divisors (28113093924).

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

21064039116 is a wasteful number, since it uses less digits than its factorization.

21064039116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989593 (or 989591 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The spelling of 21064039116 in words is "twenty-one billion, sixty-four million, thirty-nine thousand, one hundred sixteen".