21002130017137 has 2 divisors, whose sum is σ = 21002130017138. Its totient is φ = 21002130017136.

The previous prime is 21002130017131. The next prime is 21002130017171. The reversal of 21002130017137 is 73171003120012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16164774055936 + 4837355961201 = 4020544^2 + 2199399^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002130017137 - 2¹¹ = 21002130015089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002130017131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501065008568 + 10501065008569.

It is an arithmetic number, because the mean of its divisors is an integer number (10501065008569).

Almost surely, 2^{21002130017137} is an apocalyptic number.

It is an amenable number.

21002130017137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002130017137 is an equidigital number, since it uses as much as digits as its factorization.

21002130017137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

Adding to 21002130017137 its reverse (73171003120012), we get a palindrome (94173133137149).

The spelling of 21002130017137 in words is "twenty-one trillion, two billion, one hundred thirty million, seventeen thousand, one hundred thirty-seven".