21003127337 has 2 divisors, whose sum is σ = 21003127338. Its totient is φ = 21003127336.

The previous prime is 21003127333. The next prime is 21003127357. The reversal of 21003127337 is 73372130012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15874992016 + 5128135321 = 125996^2 + 71611^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003127337 - 2² = 21003127333 is a prime.

It is a super-2 number, since 2×21003127337² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21003127333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501563668 + 10501563669.

It is an arithmetic number, because the mean of its divisors is an integer number (10501563669).

Almost surely, 2^21003127337 is an apocalyptic number.

It is an amenable number.

21003127337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003127337 is an equidigital number, since it uses as much as digits as its factorization.

21003127337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 29.

Adding to 21003127337 its reverse (73372130012), we get a palindrome (94375257349).

The spelling of 21003127337 in words is "twenty-one billion, three million, one hundred twenty-seven thousand, three hundred thirty-seven".