21842201057 has 2 divisors, whose sum is σ = 21842201058. Its totient is φ = 21842201056.

The previous prime is 21842201047. The next prime is 21842201219. The reversal of 21842201057 is 75010224812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16486303201 + 5355897856 = 128399^2 + 73184^2 .

It is a cyclic number.

It is not a de Polignac number, because 21842201057 - 2¹⁶ = 21842135521 is a prime.

It is not a weakly prime, because it can be changed into another prime (21842201027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10921100528 + 10921100529.

It is an arithmetic number, because the mean of its divisors is an integer number (10921100529).

Almost surely, 2^21842201057 is an apocalyptic number.

It is an amenable number.

21842201057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21842201057 is an equidigital number, since it uses as much as digits as its factorization.

21842201057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 32.

Adding to 21842201057 its reverse (75010224812), we get a palindrome (96852425869).

The spelling of 21842201057 in words is "twenty-one billion, eight hundred forty-two million, two hundred one thousand, fifty-seven".