21711260057 has 2 divisors, whose sum is σ = 21711260058. Its totient is φ = 21711260056.

The previous prime is 21711260047. The next prime is 21711260093. The reversal of 21711260057 is 75006211712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17030511001 + 4680749056 = 130501^2 + 68416^2 .

It is a cyclic number.

It is not a de Polignac number, because 21711260057 - 2¹² = 21711255961 is a prime.

It is not a weakly prime, because it can be changed into another prime (21711260017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855630028 + 10855630029.

It is an arithmetic number, because the mean of its divisors is an integer number (10855630029).

Almost surely, 2^21711260057 is an apocalyptic number.

It is an amenable number.

21711260057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21711260057 is an equidigital number, since it uses as much as digits as its factorization.

21711260057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

Adding to 21711260057 its reverse (75006211712), we get a palindrome (96717471769).

The spelling of 21711260057 in words is "twenty-one billion, seven hundred eleven million, two hundred sixty thousand, fifty-seven".