20110121200221 has 16 divisors (see below), whose sum is σ = 29580365895360. Its totient is φ = 12073618730880.

The previous prime is 20110121200121. The next prime is 20110121200259. The reversal of 20110121200221 is 12200212101102.

It is not a de Polignac number, because 20110121200221 - 2⁷ = 20110121200093 is a prime.

It is a super-2 number, since 2×20110121200221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20110121200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110121200121) 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, 6288341491 + ... + 6288344688.

It is an arithmetic number, because the mean of its divisors is an integer number (1848772868460).

Almost surely, 2^{20110121200221} is an apocalyptic number.

It is an amenable number.

20110121200221 is a deficient number, since it is larger than the sum of its proper divisors (9470244695139).

20110121200221 is a wasteful number, since it uses less digits than its factorization.

20110121200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12576686236.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20110121200221 its reverse (12200212101102), we get a palindrome (32310333301323).

The spelling of 20110121200221 in words is "twenty trillion, one hundred ten billion, one hundred twenty-one million, two hundred thousand, two hundred twenty-one".