21210120133 has 2 divisors, whose sum is σ = 21210120134. Its totient is φ = 21210120132.

The previous prime is 21210120131. The next prime is 21210120157. The reversal of 21210120133 is 33102101212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18657647649 + 2552472484 = 136593^2 + 50522^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210120133 - 2¹ = 21210120131 is a prime.

Together with 21210120131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210120131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605060066 + 10605060067.

It is an arithmetic number, because the mean of its divisors is an integer number (10605060067).

Almost surely, 2^21210120133 is an apocalyptic number.

It is an amenable number.

21210120133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210120133 is an equidigital number, since it uses as much as digits as its factorization.

21210120133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21210120133 its reverse (33102101212), we get a palindrome (54312221345).

The spelling of 21210120133 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, one hundred thirty-three".