11112120022221 has 20 divisors (see below), whose sum is σ = 16599677289052. Its totient is φ = 7408039586688.

The previous prime is 11112120022193. The next prime is 11112120022249. The reversal of 11112120022221 is 12222002121111.

It is an interprime number because it is at equal distance from previous prime (11112120022193) and next prime (11112120022249).

It can be written as a sum of positive squares in 2 ways, for example, as 7791433846596 + 3320686175625 = 2791314^2 + 1822275^2 .

It is not a de Polignac number, because 11112120022221 - 2⁷ = 11112120022093 is a prime.

It is a super-2 number, since 2×11112120022221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11112120022194 and 11112120022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112120022021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25714875 + ... + 26143431.

Almost surely, 2^{11112120022221} is an apocalyptic number.

It is an amenable number.

11112120022221 is a deficient number, since it is larger than the sum of its proper divisors (5487557266831).

11112120022221 is an equidigital number, since it uses as much as digits as its factorization.

11112120022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748682 (or 748673 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11112120022221 its reverse (12222002121111), we get a palindrome (23334122143332).

The spelling of 11112120022221 in words is "eleven trillion, one hundred twelve billion, one hundred twenty million, twenty-two thousand, two hundred twenty-one".