53110021 has 2 divisors, whose sum is σ = 53110022. Its totient is φ = 53110020.

The previous prime is 53110019. The next prime is 53110027. The reversal of 53110021 is 12001135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50253921 + 2856100 = 7089^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 53110021 - 2¹ = 53110019 is a prime.

Together with 53110019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 53109983 and 53110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53110027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26555010 + 26555011.

It is an arithmetic number, because the mean of its divisors is an integer number (26555011).

Almost surely, 2^53110021 is an apocalyptic number.

It is an amenable number.

53110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

53110021 is an equidigital number, since it uses as much as digits as its factorization.

53110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 53110021 is about 7287.6622451922. The cubic root of 53110021 is about 375.8883142142. Note that the first 3 decimals are identical.

Adding to 53110021 its reverse (12001135), we get a palindrome (65111156).

The spelling of 53110021 in words is "fifty-three million, one hundred ten thousand, twenty-one".