21220020053 has 2 divisors, whose sum is σ = 21220020054. Its totient is φ = 21220020052.

The previous prime is 21220020043. The next prime is 21220020067. The reversal of 21220020053 is 35002002212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13373072164 + 7846947889 = 115642^2 + 88583^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220020053 - 2⁴ = 21220020037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220020043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610010026 + 10610010027.

It is an arithmetic number, because the mean of its divisors is an integer number (10610010027).

Almost surely, 2^21220020053 is an apocalyptic number.

It is an amenable number.

21220020053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220020053 is an equidigital number, since it uses as much as digits as its factorization.

21220020053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 21220020053 its reverse (35002002212), we get a palindrome (56222022265).

The spelling of 21220020053 in words is "twenty-one billion, two hundred twenty million, twenty thousand, fifty-three".