221021020121112 has 24 divisors (see below), whose sum is σ = 598598596161540. Its totient is φ = 73673673373680.

The previous prime is 221021020121059. The next prime is 221021020121113. The reversal of 221021020121112 is 211121020120122.

221021020121112 is a `hidden beast` number, since 2 + 210 + 210 + 20 + 1 + 211 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021020121113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1534868195214 + ... + 1534868195357.

Almost surely, 2^{221021020121112} is an apocalyptic number.

It is an amenable number.

221021020121112 is an abundant number, since it is smaller than the sum of its proper divisors (377577576040428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221021020121112 is a wasteful number, since it uses less digits than its factorization.

221021020121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069736390583 (or 3069736390576 counting only the distinct ones).

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

Adding to 221021020121112 its reverse (211121020120122), we get a palindrome (432142040241234).

The spelling of 221021020121112 in words is "two hundred twenty-one trillion, twenty-one billion, twenty million, one hundred twenty-one thousand, one hundred twelve".