16521099941 has 2 divisors, whose sum is σ = 16521099942. Its totient is φ = 16521099940.

The previous prime is 16521099863. The next prime is 16521099949. The reversal of 16521099941 is 14999012561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8732154916 + 7788945025 = 93446^2 + 88255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16521099941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16521099949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260549970 + 8260549971.

It is an arithmetic number, because the mean of its divisors is an integer number (8260549971).

Almost surely, 2^16521099941 is an apocalyptic number.

It is an amenable number.

16521099941 is a deficient number, since it is larger than the sum of its proper divisors (1).

16521099941 is an equidigital number, since it uses as much as digits as its factorization.

16521099941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 16521099941 in words is "sixteen billion, five hundred twenty-one million, ninety-nine thousand, nine hundred forty-one".