221021000201111 has 4 divisors (see below), whose sum is σ = 241113818401224. Its totient is φ = 200928182001000.

The previous prime is 221021000201107. The next prime is 221021000201137. The reversal of 221021000201111 is 111102000120122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221021000201111 - 2² = 221021000201107 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 (221021000201161) 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 3 ways as a sum of consecutive naturals, for example, 10046409100040 + ... + 10046409100061.

It is an arithmetic number, because the mean of its divisors is an integer number (60278454600306).

Almost surely, 2^{221021000201111} is an apocalyptic number.

221021000201111 is a deficient number, since it is larger than the sum of its proper divisors (20092818200113).

221021000201111 is a wasteful number, since it uses less digits than its factorization.

221021000201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20092818200112.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221021000201111 its reverse (111102000120122), we get a palindrome (332123000321233).

The spelling of 221021000201111 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred one thousand, one hundred eleven".