1112021555 has 4 divisors (see below), whose sum is σ = 1334425872. Its totient is φ = 889617240.

The previous prime is 1112021489. The next prime is 1112021591. The reversal of 1112021555 is 5551202111.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1112021555 - 2¹⁴ = 1112005171 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 1112021555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111202151 + ... + 111202160.

It is an arithmetic number, because the mean of its divisors is an integer number (333606468).

Almost surely, 2^1112021555 is an apocalyptic number.

1112021555 is a deficient number, since it is larger than the sum of its proper divisors (222404317).

1112021555 is an equidigital number, since it uses as much as digits as its factorization.

1112021555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222404316.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 1112021555 is about 33346.9871952475. The cubic root of 1112021555 is about 1036.0269875028.

Adding to 1112021555 its reverse (5551202111), we get a palindrome (6663223666).

The spelling of 1112021555 in words is "one billion, one hundred twelve million, twenty-one thousand, five hundred fifty-five".