1111122221 has 8 divisors (see below), whose sum is σ = 1214061888. Its totient is φ = 1008504000.

The previous prime is 1111122179. The next prime is 1111122283. The reversal of 1111122221 is 1222211111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1111122221 - 2¹⁴ = 1111105837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111122196 and 1111122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73100 + ... + 86981.

It is an arithmetic number, because the mean of its divisors is an integer number (151757736).

Almost surely, 2^1111122221 is an apocalyptic number.

1111122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111122221 is a deficient number, since it is larger than the sum of its proper divisors (102939667).

1111122221 is a wasteful number, since it uses less digits than its factorization.

1111122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160723.

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

The square root of 1111122221 is about 33333.4999812501. The cubic root of 1111122221 is about 1035.7476207406.

Adding to 1111122221 its reverse (1222211111), we get a palindrome (2333333332).

It can be divided in two parts, 11111 and 22221, that multiplied together give a triangular number (246897531 = T₂₂₂₂₁).

The spelling of 1111122221 in words is "one billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".