28221583212000 has 864 divisors, whose sum is σ = 104423873168160. Its totient is φ = 7217538048000.

The previous prime is 28221583211947. The next prime is 28221583212001. The reversal of 28221583212000 is 21238512282.

28221583212000 is a `hidden beast` number, since 2 + 82 + 2 + 1 + 58 + 321 + 200 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28221583212001) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3909344391 + ... + 3909351609.

It is an arithmetic number, because the mean of its divisors is an integer number (120860964315).

Almost surely, 2^{28221583212000} is an apocalyptic number.

28221583212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28221583212000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52211936584080).

28221583212000 is an abundant number, since it is smaller than the sum of its proper divisors (76202289956160).

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

28221583212000 is a wasteful number, since it uses less digits than its factorization.

28221583212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7425 (or 7373 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The spelling of 28221583212000 in words is "twenty-eight trillion, two hundred twenty-one billion, five hundred eighty-three million, two hundred twelve thousand".