21221101020211 has 4 divisors (see below), whose sum is σ = 21221200584000. Its totient is φ = 21221001456424.

The previous prime is 21221101020103. The next prime is 21221101020313. The reversal of 21221101020211 is 11202010112212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221101020211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221101120211) 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 3 ways as a sum of consecutive naturals, for example, 49461496 + ... + 49888693.

It is an arithmetic number, because the mean of its divisors is an integer number (5305300146000).

Almost surely, 2^{21221101020211} is an apocalyptic number.

21221101020211 is a deficient number, since it is larger than the sum of its proper divisors (99563789).

21221101020211 is an equidigital number, since it uses as much as digits as its factorization.

21221101020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99563788.

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

Adding to 21221101020211 its reverse (11202010112212), we get a palindrome (32423111132423).

The spelling of 21221101020211 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, twenty thousand, two hundred eleven".