1001140021 has 12 divisors (see below), whose sum is σ = 1215227232. Its totient is φ = 820809528.

The previous prime is 1001140003. The next prime is 1001140037. The reversal of 1001140021 is 1200411001.

It is not a de Polignac number, because 1001140021 - 2⁵ = 1001139989 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 (1001143021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 443035 + ... + 445288.

It is an arithmetic number, because the mean of its divisors is an integer number (101268936).

Almost surely, 2^1001140021 is an apocalyptic number.

It is an amenable number.

1001140021 is a deficient number, since it is larger than the sum of its proper divisors (214087211).

1001140021 is an equidigital number, since it uses as much as digits as its factorization.

1001140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888360 (or 888353 counting only the distinct ones).

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

The square root of 1001140021 is about 31640.7967820028. The cubic root of 1001140021 is about 1000.3798626861.

Adding to 1001140021 its reverse (1200411001), we get a palindrome (2201551022).

The spelling of 1001140021 in words is "one billion, one million, one hundred forty thousand, twenty-one".