111020012220221 has 4 divisors (see below), whose sum is σ = 119560013160252. Its totient is φ = 102480011280192.

The previous prime is 111020012220209. The next prime is 111020012220277. The reversal of 111020012220221 is 122022210020111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6136093768996 + 104883918451225 = 2477114^2 + 10241285^2 .

It is not a de Polignac number, because 111020012220221 - 2²² = 111020008025917 is a prime.

It is a super-2 number, since 2×111020012220221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111020012220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020012220281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4270000469996 + ... + 4270000470021.

It is an arithmetic number, because the mean of its divisors is an integer number (29890003290063).

Almost surely, 2^{111020012220221} is an apocalyptic number.

It is an amenable number.

111020012220221 is a deficient number, since it is larger than the sum of its proper divisors (8540000940031).

111020012220221 is an equidigital number, since it uses as much as digits as its factorization.

111020012220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540000940030.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111020012220221 its reverse (122022210020111), we get a palindrome (233042222240332).

The spelling of 111020012220221 in words is "one hundred eleven trillion, twenty billion, twelve million, two hundred twenty thousand, two hundred twenty-one".