1111220012021 has 18 divisors (see below), whose sum is σ = 1338754689090. Its totient is φ = 919630320672.

The previous prime is 1111220011897. The next prime is 1111220012069. The reversal of 1111220012021 is 1202100221111.

It can be written as a sum of positive squares in 3 ways, for example, as 462011121796 + 649208890225 = 679714^2 + 805735^2 .

It is not a de Polignac number, because 1111220012021 - 2¹⁰ = 1111220010997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111220011987 and 1111220012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111220012081) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13441526 + ... + 13523943.

It is an arithmetic number, because the mean of its divisors is an integer number (74375260505).

Almost surely, 2^{1111220012021} is an apocalyptic number.

It is an amenable number.

1111220012021 is a deficient number, since it is larger than the sum of its proper divisors (227534677069).

1111220012021 is an equidigital number, since it uses as much as digits as its factorization.

1111220012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26965541 (or 26965505 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1111220012021 its reverse (1202100221111), we get a palindrome (2313320233132).

The spelling of 1111220012021 in words is "one trillion, one hundred eleven billion, two hundred twenty million, twelve thousand, twenty-one".