201111122222021 has 16 divisors (see below), whose sum is σ = 221593815713088. Its totient is φ = 180995524512000.

The previous prime is 201111122221949. The next prime is 201111122222027. The reversal of 201111122222021 is 120222221111102.

It is a de Polignac number, because none of the positive numbers 2^k-201111122222021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111122221984 and 201111122222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111122222027) 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, 2382755 + ... + 20196528.

It is an arithmetic number, because the mean of its divisors is an integer number (13849613482068).

Almost surely, 2^{201111122222021} is an apocalyptic number.

It is an amenable number.

201111122222021 is a deficient number, since it is larger than the sum of its proper divisors (20482693491067).

201111122222021 is a wasteful number, since it uses less digits than its factorization.

201111122222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22587412.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 201111122222021 its reverse (120222221111102), we get a palindrome (321333343333123).

The spelling of 201111122222021 in words is "two hundred one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, twenty-one".