1111220021221 has 4 divisors (see below), whose sum is σ = 1111312874700. Its totient is φ = 1111127167744.

The previous prime is 1111220021209. The next prime is 1111220021257. The reversal of 1111220021221 is 1221200221111.

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 50618700196 + 1060601321025 = 224986^2 + 1029855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111220021221 - 2⁵ = 1111220021189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111220021195 and 1111220021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111220021281) 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, 46408786 + ... + 46432723.

It is an arithmetic number, because the mean of its divisors is an integer number (277828218675).

Almost surely, 2^{1111220021221} is an apocalyptic number.

It is an amenable number.

1111220021221 is a deficient number, since it is larger than the sum of its proper divisors (92853479).

1111220021221 is an equidigital number, since it uses as much as digits as its factorization.

1111220021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92853478.

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

Adding to 1111220021221 its reverse (1221200221111), we get a palindrome (2332420242332).

The spelling of 1111220021221 in words is "one trillion, one hundred eleven billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".