221110111202021 has 16 divisors (see below), whose sum is σ = 226169127624960. Its totient is φ = 216104525852160.

The previous prime is 221110111202011. The next prime is 221110111202023. The reversal of 221110111202021 is 120202111011122.

It is a cyclic number.

It is not a de Polignac number, because 221110111202021 - 2¹⁴ = 221110111185637 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 (221110111202023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10736525 + ... + 23611293.

It is an arithmetic number, because the mean of its divisors is an integer number (14135570476560).

Almost surely, 2^{221110111202021} is an apocalyptic number.

It is an amenable number.

221110111202021 is a deficient number, since it is larger than the sum of its proper divisors (5059016422939).

221110111202021 is a wasteful number, since it uses less digits than its factorization.

221110111202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12876844.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221110111202021 its reverse (120202111011122), we get a palindrome (341312222213143).

The spelling of 221110111202021 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred eleven million, two hundred two thousand, twenty-one".