1120817021 has 4 divisors (see below), whose sum is σ = 1186747452. Its totient is φ = 1054886592.

The previous prime is 1120817017. The next prime is 1120817051. The reversal of 1120817021 is 1207180211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 576528121 + 544288900 = 24011^2 + 23330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1120817021 - 2² = 1120817017 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 (1120817051) 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, 32965190 + ... + 32965223.

It is an arithmetic number, because the mean of its divisors is an integer number (296686863).

Almost surely, 2^1120817021 is an apocalyptic number.

It is an amenable number.

1120817021 is a deficient number, since it is larger than the sum of its proper divisors (65930431).

1120817021 is an equidigital number, since it uses as much as digits as its factorization.

1120817021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65930430.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 1120817021 is about 33478.6054219706. The cubic root of 1120817021 is about 1038.7512814155.

Adding to 1120817021 its reverse (1207180211), we get a palindrome (2327997232).

The spelling of 1120817021 in words is "one billion, one hundred twenty million, eight hundred seventeen thousand, twenty-one".