2040001021 has 2 divisors, whose sum is σ = 2040001022. Its totient is φ = 2040001020.

The previous prime is 2040000997. The next prime is 2040001049. The reversal of 2040001021 is 1201000402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1335098521 + 704902500 = 36539^2 + 26550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2040001021 - 2¹⁵ = 2039968253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2040000989 and 2040001007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2040061021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020000510 + 1020000511.

It is an arithmetic number, because the mean of its divisors is an integer number (1020000511).

Almost surely, 2^2040001021 is an apocalyptic number.

It is an amenable number.

2040001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2040001021 is an equidigital number, since it uses as much as digits as its factorization.

2040001021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2040001021 is about 45166.3704652034. The cubic root of 2040001021 is about 1268.2653526617.

Adding to 2040001021 its reverse (1201000402), we get a palindrome (3241001423).

The spelling of 2040001021 in words is "two billion, forty million, one thousand, twenty-one".