221100110021 has 8 divisors (see below), whose sum is σ = 253352560320. Its totient is φ = 189014339808.

The previous prime is 221100109981. The next prime is 221100110041. The reversal of 221100110021 is 120011001122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-221100110021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221100109984 and 221100110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100110041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41667176 + ... + 41672481.

It is an arithmetic number, because the mean of its divisors is an integer number (31669070040).

Almost surely, 2^221100110021 is an apocalyptic number.

It is an amenable number.

221100110021 is a deficient number, since it is larger than the sum of its proper divisors (32252450299).

221100110021 is an equidigital number, since it uses as much as digits as its factorization.

221100110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83340043.

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

Adding to 221100110021 its reverse (120011001122), we get a palindrome (341111111143).

The spelling of 221100110021 in words is "two hundred twenty-one billion, one hundred million, one hundred ten thousand, twenty-one".