2040011021 has 4 divisors (see below), whose sum is σ = 2095146492. Its totient is φ = 1984875552.

The previous prime is 2040010997. The next prime is 2040011023. The reversal of 2040011021 is 1201100402.

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 1543389796 + 496621225 = 39286^2 + 22285^2 .

It is a cyclic number.

It is not a de Polignac number, because 2040011021 - 2⁶ = 2040010957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2040010993 and 2040011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2040011023) 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, 27567680 + ... + 27567753.

It is an arithmetic number, because the mean of its divisors is an integer number (523786623).

Almost surely, 2^2040011021 is an apocalyptic number.

It is an amenable number.

2040011021 is a deficient number, since it is larger than the sum of its proper divisors (55135471).

2040011021 is an equidigital number, since it uses as much as digits as its factorization.

2040011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55135470.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2040011021 is about 45166.4811669007. The cubic root of 2040011021 is about 1268.2674249863.

Adding to 2040011021 its reverse (1201100402), we get a palindrome (3241111423).

The spelling of 2040011021 in words is "two billion, forty million, eleven thousand, twenty-one".