21013210133 has 2 divisors, whose sum is σ = 21013210134. Its totient is φ = 21013210132.

The previous prime is 21013210129. The next prime is 21013210157. The reversal of 21013210133 is 33101231012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20885452324 + 127757809 = 144518^2 + 11303^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013210133 - 2² = 21013210129 is a prime.

It is a super-2 number, since 2×21013210133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21013210123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506605066 + 10506605067.

It is an arithmetic number, because the mean of its divisors is an integer number (10506605067).

Almost surely, 2^21013210133 is an apocalyptic number.

It is an amenable number.

21013210133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013210133 is an equidigital number, since it uses as much as digits as its factorization.

21013210133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21013210133 its reverse (33101231012), we get a palindrome (54114441145).

The spelling of 21013210133 in words is "twenty-one billion, thirteen million, two hundred ten thousand, one hundred thirty-three".