221020121111112 has 24 divisors (see below), whose sum is σ = 598596161342790. Its totient is φ = 73673373703680.

The previous prime is 221020121111057. The next prime is 221020121111143. The reversal of 221020121111112 is 211111121020122.

It is a happy number.

221020121111112 is a `hidden beast` number, since 221 + 0 + 201 + 21 + 111 + 112 = 666.

It can be written as a sum of positive squares in only one way, i.e., 137211845352516 + 83808275758596 = 11713746^2 + 9154686^2 .

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 an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1534861952089 + ... + 1534861952232.

Almost surely, 2^{221020121111112} is an apocalyptic number.

It is an amenable number.

221020121111112 is an abundant number, since it is smaller than the sum of its proper divisors (377576040231678).

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

221020121111112 is a wasteful number, since it uses less digits than its factorization.

221020121111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069723904333 (or 3069723904326 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221020121111112 its reverse (211111121020122), we get a palindrome (432131242131234).

It can be divided in two parts, 22102012 and 1111112, that added together give a square (23213124 = 4818²).

The spelling of 221020121111112 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twelve".