221100111021 has 8 divisors (see below), whose sum is σ = 301655965600. Its totient is φ = 143972165232.

The previous prime is 221100110999. The next prime is 221100111083. The reversal of 221100111021 is 120111001122.

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

It is not a de Polignac number, because 221100111021 - 2⁵ = 221100110989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221100110988 and 221100111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100111091) 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, 856977046 + ... + 856977303.

It is an arithmetic number, because the mean of its divisors is an integer number (37706995700).

Almost surely, 2^221100111021 is an apocalyptic number.

It is an amenable number.

221100111021 is a deficient number, since it is larger than the sum of its proper divisors (80555854579).

221100111021 is a wasteful number, since it uses less digits than its factorization.

221100111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713954395.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221100111021 its reverse (120111001122), we get a palindrome (341211112143).

The spelling of 221100111021 in words is "two hundred twenty-one billion, one hundred million, one hundred eleven thousand, twenty-one".