1140001021 has 4 divisors (see below), whose sum is σ = 1147262332. Its totient is φ = 1132739712.

The previous prime is 1140000997. The next prime is 1140001091. The reversal of 1140001021 is 1201000411.

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 279224100 + 860776921 = 16710^2 + 29339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1140001021 - 2⁵ = 1140000989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1140000989 and 1140001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1140001091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3630420 + ... + 3630733.

It is an arithmetic number, because the mean of its divisors is an integer number (286815583).

Almost surely, 2^1140001021 is an apocalyptic number.

It is an amenable number.

1140001021 is a deficient number, since it is larger than the sum of its proper divisors (7261311).

1140001021 is an equidigital number, since it uses as much as digits as its factorization.

1140001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7261310.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1140001021 is about 33763.9011519700. The cubic root of 1140001021 is about 1044.6442386881.

Adding to 1140001021 its reverse (1201000411), we get a palindrome (2341001432).

The spelling of 1140001021 in words is "one billion, one hundred forty million, one thousand, twenty-one".