28000039000021 has 8 divisors (see below), whose sum is σ = 32153154832800. Its totient is φ = 24114866124240.

The previous prime is 28000038999997. The next prime is 28000039000051. The reversal of 28000039000021 is 12000093000082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28000039000021 - 2⁷ = 28000038999893 is a prime.

It is a super-3 number, since 3×28000039000021³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28000039000021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28000039000051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66985739026 + ... + 66985739443.

It is an arithmetic number, because the mean of its divisors is an integer number (4019144354100).

Almost surely, 2^{28000039000021} is an apocalyptic number.

It is an amenable number.

28000039000021 is a deficient number, since it is larger than the sum of its proper divisors (4153115832779).

28000039000021 is a wasteful number, since it uses less digits than its factorization.

28000039000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133971478499.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 28000039000021 in words is "twenty-eight trillion, thirty-nine million, twenty-one", and thus it is an aban number and an uban number.