21112120120221 has 32 divisors (see below), whose sum is σ = 33684998789120. Its totient is φ = 12991362593472.

The previous prime is 21112120120183. The next prime is 21112120120327. The reversal of 21112120120221 is 12202102121112.

21112120120221 is a `hidden beast` number, since 2 + 111 + 212 + 0 + 120 + 221 = 666.

It is not a de Polignac number, because 21112120120221 - 2¹³ = 21112120112029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112120120194 and 21112120120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112120121221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4809411 + ... + 8084223.

It is an arithmetic number, because the mean of its divisors is an integer number (1052656212160).

Almost surely, 2^{21112120120221} is an apocalyptic number.

It is an amenable number.

21112120120221 is a deficient number, since it is larger than the sum of its proper divisors (12572878668899).

21112120120221 is a wasteful number, since it uses less digits than its factorization.

21112120120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293202 (or 3293196 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112120120221 its reverse (12202102121112), we get a palindrome (33314222241333).

The spelling of 21112120120221 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty million, one hundred twenty thousand, two hundred twenty-one".