1120001021 has 4 divisors (see below), whose sum is σ = 1185883452. Its totient is φ = 1054118592.

The previous prime is 1120000991. The next prime is 1120001033. The reversal of 1120001021 is 1201000211.

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 790396996 + 329604025 = 28114^2 + 18155^2 .

It is not a de Polignac number, because 1120001021 - 2¹⁴ = 1119984637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120001081) 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, 32941190 + ... + 32941223.

It is an arithmetic number, because the mean of its divisors is an integer number (296470863).

Almost surely, 2^1120001021 is an apocalyptic number.

It is an amenable number.

1120001021 is a deficient number, since it is larger than the sum of its proper divisors (65882431).

1120001021 is an equidigital number, since it uses as much as digits as its factorization.

1120001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65882430.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1120001021 is about 33466.4163154647. The cubic root of 1120001021 is about 1038.4991359378.

Adding to 1120001021 its reverse (1201000211), we get a palindrome (2321001232).

The spelling of 1120001021 in words is "one billion, one hundred twenty million, one thousand, twenty-one".