111121020201221 has 4 divisors (see below), whose sum is σ = 111121633088844. Its totient is φ = 111120407313600.

The previous prime is 111121020201199. The next prime is 111121020201313. The reversal of 111121020201221 is 122102020121111.

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 978388048225 + 110142632152996 = 989135^2 + 10494886^2 .

It is a cyclic number.

It is not a de Polignac number, because 111121020201221 - 2⁴² = 106722973690117 is a prime.

It is a super-2 number, since 2×111121020201221² (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 111121020201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121010201221) 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, 306171770 + ... + 306534491.

It is an arithmetic number, because the mean of its divisors is an integer number (27780408272211).

Almost surely, 2^{111121020201221} is an apocalyptic number.

It is an amenable number.

111121020201221 is a deficient number, since it is larger than the sum of its proper divisors (612887623).

111121020201221 is an equidigital number, since it uses as much as digits as its factorization.

111121020201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612887622.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111121020201221 its reverse (122102020121111), we get a palindrome (233223040322332).

The spelling of 111121020201221 in words is "one hundred eleven trillion, one hundred twenty-one billion, twenty million, two hundred one thousand, two hundred twenty-one".