221021000100111 has 4 divisors (see below), whose sum is σ = 294694666800152. Its totient is φ = 147347333400072.

The previous prime is 221021000100107. The next prime is 221021000100203. The reversal of 221021000100111 is 111001000120122.

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

It is not a de Polignac number, because 221021000100111 - 2² = 221021000100107 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 (221021000107111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36836833350016 + ... + 36836833350021.

It is an arithmetic number, because the mean of its divisors is an integer number (73673666700038).

Almost surely, 2^{221021000100111} is an apocalyptic number.

221021000100111 is a deficient number, since it is larger than the sum of its proper divisors (73673666700041).

221021000100111 is an equidigital number, since it uses as much as digits as its factorization.

221021000100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73673666700040.

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

Adding to 221021000100111 its reverse (111001000120122), we get a palindrome (332022000220233).

The spelling of 221021000100111 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred thousand, one hundred eleven".