1011221120221 has 4 divisors (see below), whose sum is σ = 1089007360252. Its totient is φ = 933434880192.

The previous prime is 1011221120177. The next prime is 1011221120227. The reversal of 1011221120221 is 1220211221101.

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 185748932196 + 825472188025 = 430986^2 + 908555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011221120221 - 2²¹ = 1011219023069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011221120195 and 1011221120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221120227) 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, 38893119996 + ... + 38893120021.

It is an arithmetic number, because the mean of its divisors is an integer number (272251840063).

Almost surely, 2^{1011221120221} is an apocalyptic number.

It is an amenable number.

1011221120221 is a deficient number, since it is larger than the sum of its proper divisors (77786240031).

1011221120221 is an equidigital number, since it uses as much as digits as its factorization.

1011221120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77786240030.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1011221120221 its reverse (1220211221101), we get a palindrome (2231432341322).

The spelling of 1011221120221 in words is "one trillion, eleven billion, two hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".