21116499930481 has 2 divisors, whose sum is σ = 21116499930482. Its totient is φ = 21116499930480.

The previous prime is 21116499930443. The next prime is 21116499930521. The reversal of 21116499930481 is 18403999461112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19772616182881 + 1343883747600 = 4446641^2 + 1159260^2 .

It is a cyclic number.

It is not a de Polignac number, because 21116499930481 - 2⁷ = 21116499930353 is a prime.

It is a super-2 number, since 2×21116499930481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21116499930431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558249965240 + 10558249965241.

It is an arithmetic number, because the mean of its divisors is an integer number (10558249965241).

Almost surely, 2^{21116499930481} is an apocalyptic number.

It is an amenable number.

21116499930481 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116499930481 is an equidigital number, since it uses as much as digits as its factorization.

21116499930481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3359232, while the sum is 58.

The spelling of 21116499930481 in words is "twenty-one trillion, one hundred sixteen billion, four hundred ninety-nine million, nine hundred thirty thousand, four hundred eighty-one".