1111112221021 has 16 divisors (see below), whose sum is σ = 1284505231680. Its totient is φ = 949883150080.

The previous prime is 1111112220997. The next prime is 1111112221027. The reversal of 1111112221021 is 1201222111111.

It is a cyclic number.

It is not a de Polignac number, because 1111112221021 - 2⁷ = 1111112220893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111112220986 and 1111112221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111112221027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2280886 + ... + 2724823.

It is an arithmetic number, because the mean of its divisors is an integer number (80281576980).

Almost surely, 2^{1111112221021} is an apocalyptic number.

1111112221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111112221021 is a deficient number, since it is larger than the sum of its proper divisors (173393010659).

1111112221021 is a wasteful number, since it uses less digits than its factorization.

1111112221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006924.

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

Adding to 1111112221021 its reverse (1201222111111), we get a palindrome (2312334332132).

The spelling of 1111112221021 in words is "one trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, twenty-one".