21033110057 has 2 divisors, whose sum is σ = 21033110058. Its totient is φ = 21033110056.

The previous prime is 21033110027. The next prime is 21033110071. The reversal of 21033110057 is 75001133012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16645902361 + 4387207696 = 129019^2 + 66236^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033110057 - 2¹⁰ = 21033109033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21033110027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516555028 + 10516555029.

It is an arithmetic number, because the mean of its divisors is an integer number (10516555029).

Almost surely, 2^21033110057 is an apocalyptic number.

It is an amenable number.

21033110057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033110057 is an equidigital number, since it uses as much as digits as its factorization.

21033110057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 23.

Adding to 21033110057 its reverse (75001133012), we get a palindrome (96034243069).

The spelling of 21033110057 in words is "twenty-one billion, thirty-three million, one hundred ten thousand, fifty-seven".