21221211000211 has 4 divisors (see below), whose sum is σ = 21952976896800. Its totient is φ = 20489445103624.

The previous prime is 21221211000193. The next prime is 21221211000217. The reversal of 21221211000211 is 11200011212212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21221211000211 - 2⁷ = 21221211000083 is a prime.

It is a super-5 number, since 5×21221211000211⁵ (a number of 68 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221211000217) 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, 365882948251 + ... + 365882948308.

It is an arithmetic number, because the mean of its divisors is an integer number (5488244224200).

Almost surely, 2^{21221211000211} is an apocalyptic number.

21221211000211 is a deficient number, since it is larger than the sum of its proper divisors (731765896589).

21221211000211 is an equidigital number, since it uses as much as digits as its factorization.

21221211000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731765896588.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221211000211 its reverse (11200011212212), we get a palindrome (32421222212423).

The spelling of 21221211000211 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred eleven", and thus it is an aban number.