20110120222221 has 12 divisors (see below), whose sum is σ = 29397926751648. Its totient is φ = 13245219744264.

The previous prime is 20110120222219. The next prime is 20110120222229. The reversal of 20110120222221 is 12222202101102.

It is a happy number.

20110120222221 is a `hidden beast` number, since 201 + 1 + 0 + 1 + 20 + 222 + 221 = 666.

It is not a de Polignac number, because 20110120222221 - 2¹ = 20110120222219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20110120222194 and 20110120222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110120222229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13460588425 + ... + 13460589918.

It is an arithmetic number, because the mean of its divisors is an integer number (2449827229304).

Almost surely, 2^{20110120222221} is an apocalyptic number.

It is an amenable number.

20110120222221 is a deficient number, since it is larger than the sum of its proper divisors (9287806529427).

20110120222221 is a wasteful number, since it uses less digits than its factorization.

20110120222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26921178432 (or 26921178429 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20110120222221 its reverse (12222202101102), we get a palindrome (32332322323323).

The spelling of 20110120222221 in words is "twenty trillion, one hundred ten billion, one hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".