281221005006 has 16 divisors (see below), whose sum is σ = 624935566800. Its totient is φ = 93740334984.

The previous prime is 281221005001. The next prime is 281221005007. The reversal of 281221005006 is 600500122182.

It is a happy number.

281221005006 is a `hidden beast` number, since 28 + 122 + 10 + 0 + 500 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281221005001) 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, 2603898141 + ... + 2603898248.

It is an arithmetic number, because the mean of its divisors is an integer number (39058472925).

Almost surely, 2^281221005006 is an apocalyptic number.

281221005006 is an abundant number, since it is smaller than the sum of its proper divisors (343714561794).

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

281221005006 is a wasteful number, since it uses less digits than its factorization.

281221005006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207796400 (or 5207796394 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 281221005006 its reverse (600500122182), we get a palindrome (881721127188).

The spelling of 281221005006 in words is "two hundred eighty-one billion, two hundred twenty-one million, five thousand, six".