1120021553 has 8 divisors (see below), whose sum is σ = 1297559808. Its totient is φ = 946867104.

The previous prime is 1120021439. The next prime is 1120021571. The reversal of 1120021553 is 3551200211.

It is a happy number.

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 1120021553 - 2⁸ = 1120021297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1120021583) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1095401 + ... + 1096422.

It is an arithmetic number, because the mean of its divisors is an integer number (162194976).

Almost surely, 2^1120021553 is an apocalyptic number.

It is an amenable number.

1120021553 is a deficient number, since it is larger than the sum of its proper divisors (177538255).

1120021553 is an equidigital number, since it uses as much as digits as its factorization.

1120021553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191903.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1120021553 is about 33466.7230693416. The cubic root of 1120021553 is about 1038.5054818647.

Adding to 1120021553 its reverse (3551200211), we get a palindrome (4671221764).

The spelling of 1120021553 in words is "one billion, one hundred twenty million, twenty-one thousand, five hundred fifty-three".