21039084012 has 12 divisors (see below), whose sum is σ = 49091196056. Its totient is φ = 7013028000.

The previous prime is 21039083977. The next prime is 21039084019. The reversal of 21039084012 is 21048093012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21039084012³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21039084019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876628489 + ... + 876628512.

Almost surely, 2^21039084012 is an apocalyptic number.

It is an amenable number.

21039084012 is an abundant number, since it is smaller than the sum of its proper divisors (28052112044).

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

21039084012 is a wasteful number, since it uses less digits than its factorization.

21039084012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753257008 (or 1753257006 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 21039084012 in words is "twenty-one billion, thirty-nine million, eighty-four thousand, twelve".