221110111021 has 16 divisors (see below), whose sum is σ = 225025931520. Its totient is φ = 217232092800.

The previous prime is 221110110943. The next prime is 221110111097. The reversal of 221110111021 is 120111011122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221110111021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221110110992 and 221110111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221110111421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12573591 + ... + 12591163.

It is an arithmetic number, because the mean of its divisors is an integer number (14064120720).

Almost surely, 2^221110111021 is an apocalyptic number.

It is an amenable number.

221110111021 is a deficient number, since it is larger than the sum of its proper divisors (3915820499).

221110111021 is a wasteful number, since it uses less digits than its factorization.

221110111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18636.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221110111021 its reverse (120111011122), we get a palindrome (341221122143).

The spelling of 221110111021 in words is "two hundred twenty-one billion, one hundred ten million, one hundred eleven thousand, twenty-one".