2040021457 has 2 divisors, whose sum is σ = 2040021458. Its totient is φ = 2040021456.

The previous prime is 2040021439. The next prime is 2040021491. The reversal of 2040021457 is 7541200402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144874896 + 895146561 = 33836^2 + 29919^2 .

It is a cyclic number.

It is not a de Polignac number, because 2040021457 - 2¹⁹ = 2039497169 is a prime.

It is not a weakly prime, because it can be changed into another prime (2040021157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020010728 + 1020010729.

It is an arithmetic number, because the mean of its divisors is an integer number (1020010729).

Almost surely, 2^2040021457 is an apocalyptic number.

It is an amenable number.

2040021457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2040021457 is an equidigital number, since it uses as much as digits as its factorization.

2040021457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 2040021457 is about 45166.5966949027. The cubic root of 2040021457 is about 1268.2695876570.

Adding to 2040021457 its reverse (7541200402), we get a palindrome (9581221859).

The spelling of 2040021457 in words is "two billion, forty million, twenty-one thousand, four hundred fifty-seven".