1111120021 has 8 divisors (see below), whose sum is σ = 1212372288. Its totient is φ = 1009908000.

The previous prime is 1111120013. The next prime is 1111120039. The reversal of 1111120021 is 1200211111.

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 1111120021 - 2³ = 1111120013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111120121) 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, 101736 + ... + 112126.

It is an arithmetic number, because the mean of its divisors is an integer number (151546536).

Almost surely, 2^1111120021 is an apocalyptic number.

1111120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111120021 is a deficient number, since it is larger than the sum of its proper divisors (101252267).

1111120021 is a wasteful number, since it uses less digits than its factorization.

1111120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20123.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1111120021 is about 33333.4669813987. The cubic root of 1111120021 is about 1035.7469371535.

Adding to 1111120021 its reverse (1200211111), we get a palindrome (2311331132).

It can be divided in two parts, 1111 and 120021, that multiplied together give a palindrome (133343331).

The spelling of 1111120021 in words is "one billion, one hundred eleven million, one hundred twenty thousand, twenty-one".