221021111101 has 8 divisors (see below), whose sum is σ = 252709714944. Its totient is φ = 189361047120.

The previous prime is 221021111071. The next prime is 221021111107. The reversal of 221021111101 is 101111120122.

It is a happy number.

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

It is not a de Polignac number, because 221021111101 - 2¹⁷ = 221020980029 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 (221021111107) 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, 7118365 + ... + 7149346.

It is an arithmetic number, because the mean of its divisors is an integer number (31588714368).

Almost surely, 2^221021111101 is an apocalyptic number.

It is an amenable number.

221021111101 is a deficient number, since it is larger than the sum of its proper divisors (31688603843).

221021111101 is a wasteful number, since it uses less digits than its factorization.

221021111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14269931.

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

Adding to 221021111101 its reverse (101111120122), we get a palindrome (322132231223).

The spelling of 221021111101 in words is "two hundred twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred one".