1120255021 has 4 divisors (see below), whose sum is σ = 1130532700. Its totient is φ = 1109977344.

The previous prime is 1120254983. The next prime is 1120255061. The reversal of 1120255021 is 1205520211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1205520211 = 7 ⋅172217173.

It can be written as a sum of positive squares in 2 ways, for example, as 840362121 + 279892900 = 28989^2 + 16730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1120255021 - 2⁷ = 1120254893 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 1120255021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120255061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5138676 + ... + 5138893.

It is an arithmetic number, because the mean of its divisors is an integer number (282633175).

Almost surely, 2^1120255021 is an apocalyptic number.

It is an amenable number.

1120255021 is a deficient number, since it is larger than the sum of its proper divisors (10277679).

1120255021 is a wasteful number, since it uses less digits than its factorization.

1120255021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10277678.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1120255021 is about 33470.2109494398. The cubic root of 1120255021 is about 1038.5776355218.

Adding to 1120255021 its reverse (1205520211), we get a palindrome (2325775232).

The spelling of 1120255021 in words is "one billion, one hundred twenty million, two hundred fifty-five thousand, twenty-one".