1111222222021 has 4 divisors (see below), whose sum is σ = 1111227094732. Its totient is φ = 1111217349312.

The previous prime is 1111222221997. The next prime is 1111222222027. The reversal of 1111222222021 is 1202222221111.

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 191130724225 + 920091497796 = 437185^2 + 959214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111222222021 - 2²⁹ = 1110685351109 is a prime.

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 1111222222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111222222027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2076570 + ... + 2556283.

It is an arithmetic number, because the mean of its divisors is an integer number (277806773683).

Almost surely, 2^{1111222222021} is an apocalyptic number.

It is an amenable number.

1111222222021 is a deficient number, since it is larger than the sum of its proper divisors (4872711).

1111222222021 is an equidigital number, since it uses as much as digits as its factorization.

1111222222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872710.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1111222222021 its reverse (1202222221111), we get a palindrome (2313444443132).

The spelling of 1111222222021 in words is "one trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-one".