21110100221 has 16 divisors (see below), whose sum is σ = 24230568960. Its totient is φ = 18015903360.

The previous prime is 21110100169. The next prime is 21110100223. The reversal of 21110100221 is 12200101112.

It is not a de Polignac number, because 21110100221 - 2²² = 21105905917 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 (21110100223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4744820 + ... + 4749266.

It is an arithmetic number, because the mean of its divisors is an integer number (1514410560).

Almost surely, 2^21110100221 is an apocalyptic number.

It is an amenable number.

21110100221 is a deficient number, since it is larger than the sum of its proper divisors (3120468739).

21110100221 is a wasteful number, since it uses less digits than its factorization.

21110100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7244.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21110100221 its reverse (12200101112), we get a palindrome (33310201333).

The spelling of 21110100221 in words is "twenty-one billion, one hundred ten million, one hundred thousand, two hundred twenty-one".