21120000221 has 8 divisors (see below), whose sum is σ = 22287586080. Its totient is φ = 19958015088.

The previous prime is 21120000193. The next prime is 21120000227. The reversal of 21120000221 is 12200002112.

It is a happy number.

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 21120000221 - 2²² = 21115805917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120000227) by changing a digit.

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, 1392431 + ... + 1407516.

It is an arithmetic number, because the mean of its divisors is an integer number (2785948260).

Almost surely, 2^21120000221 is an apocalyptic number.

It is an amenable number.

21120000221 is a deficient number, since it is larger than the sum of its proper divisors (1167585859).

21120000221 is a wasteful number, since it uses less digits than its factorization.

21120000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800363.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21120000221 its reverse (12200002112), we get a palindrome (33320002333).

The spelling of 21120000221 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-one", and thus it is an aban number.