201110220100021 has 4 divisors (see below), whose sum is σ = 201125688940044. Its totient is φ = 201094751260000.

The previous prime is 201110220100007. The next prime is 201110220100051. The reversal of 201110220100021 is 120001022011102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50883255562500 + 150226964537521 = 7133250^2 + 12256711^2 .

It is a cyclic number.

It is not a de Polignac number, because 201110220100021 - 2¹¹ = 201110220097973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201110220099974 and 201110220100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201110220100051) 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, 7734400510 + ... + 7734426511.

It is an arithmetic number, because the mean of its divisors is an integer number (50281422235011).

Almost surely, 2^{201110220100021} is an apocalyptic number.

It is an amenable number.

201110220100021 is a deficient number, since it is larger than the sum of its proper divisors (15468840023).

201110220100021 is a wasteful number, since it uses less digits than its factorization.

201110220100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15468840022.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201110220100021 its reverse (120001022011102), we get a palindrome (321111242111123).

The spelling of 201110220100021 in words is "two hundred one trillion, one hundred ten billion, two hundred twenty million, one hundred thousand, twenty-one".