2021315557 has 2 divisors, whose sum is σ = 2021315558. Its totient is φ = 2021315556.

The previous prime is 2021315507. The next prime is 2021315629. The reversal of 2021315557 is 7555131202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1465817796 + 555497761 = 38286^2 + 23569^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021315557 - 2¹⁵ = 2021282789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021315507) 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, 1010657778 + 1010657779.

It is an arithmetic number, because the mean of its divisors is an integer number (1010657779).

Almost surely, 2^2021315557 is an apocalyptic number.

It is an amenable number.

2021315557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021315557 is an equidigital number, since it uses as much as digits as its factorization.

2021315557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 2021315557 is about 44959.0431059203. The cubic root of 2021315557 is about 1264.3812285177.

Adding to 2021315557 its reverse (7555131202), we get a palindrome (9576446759).

The spelling of 2021315557 in words is "two billion, twenty-one million, three hundred fifteen thousand, five hundred fifty-seven".