2021631457 has 2 divisors, whose sum is σ = 2021631458. Its totient is φ = 2021631456.

The previous prime is 2021631433. The next prime is 2021631481. The reversal of 2021631457 is 7541361202.

It is a balanced prime because it is at equal distance from previous prime (2021631433) and next prime (2021631481).

It can be written as a sum of positive squares in only one way, i.e., 2006233681 + 15397776 = 44791^2 + 3924^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021631457 - 2²³ = 2013242849 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021631487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010815728 + 1010815729.

It is an arithmetic number, because the mean of its divisors is an integer number (1010815729).

Almost surely, 2^2021631457 is an apocalyptic number.

It is an amenable number.

2021631457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021631457 is an equidigital number, since it uses as much as digits as its factorization.

2021631457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 2021631457 is about 44962.5561662146. The cubic root of 2021631457 is about 1264.4470927553.

Adding to 2021631457 its reverse (7541361202), we get a palindrome (9562992659).

The spelling of 2021631457 in words is "two billion, twenty-one million, six hundred thirty-one thousand, four hundred fifty-seven".