21220065133 has 2 divisors, whose sum is σ = 21220065134. Its totient is φ = 21220065132.

The previous prime is 21220065077. The next prime is 21220065143. The reversal of 21220065133 is 33156002212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12338322084 + 8881743049 = 111078^2 + 94243^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220065133 - 2¹³ = 21220056941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220065098 and 21220065107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220065143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610032566 + 10610032567.

It is an arithmetic number, because the mean of its divisors is an integer number (10610032567).

Almost surely, 2^21220065133 is an apocalyptic number.

It is an amenable number.

21220065133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220065133 is an equidigital number, since it uses as much as digits as its factorization.

21220065133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21220065133 its reverse (33156002212), we get a palindrome (54376067345).

The spelling of 21220065133 in words is "twenty-one billion, two hundred twenty million, sixty-five thousand, one hundred thirty-three".