21220201100111 has 6 divisors (see below), whose sum is σ = 22978087581960. Its totient is φ = 19587877938408.

The previous prime is 21220201100099. The next prime is 21220201100207. The reversal of 21220201100111 is 11100110202212.

It is not a de Polignac number, because 21220201100111 - 2²² = 21220196905807 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 (21220201160111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62781659891 + ... + 62781660228.

It is an arithmetic number, because the mean of its divisors is an integer number (3829681263660).

Almost surely, 2^{21220201100111} is an apocalyptic number.

21220201100111 is a deficient number, since it is larger than the sum of its proper divisors (1757886481849).

21220201100111 is a wasteful number, since it uses less digits than its factorization.

21220201100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125563320145 (or 125563320132 counting only the distinct ones).

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

Adding to 21220201100111 its reverse (11100110202212), we get a palindrome (32320311302323).

The spelling of 21220201100111 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, one hundred thousand, one hundred eleven".