16950621521 has 2 divisors, whose sum is σ = 16950621522. Its totient is φ = 16950621520.

The previous prime is 16950621473. The next prime is 16950621529. The reversal of 16950621521 is 12512605961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16926010000 + 24611521 = 130100^2 + 4961^2 .

It is an emirp because it is prime and its reverse (12512605961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16950621521 - 2¹⁴ = 16950605137 is a prime.

It is not a weakly prime, because it can be changed into another prime (16950621529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8475310760 + 8475310761.

It is an arithmetic number, because the mean of its divisors is an integer number (8475310761).

Almost surely, 2^16950621521 is an apocalyptic number.

It is an amenable number.

16950621521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16950621521 is an equidigital number, since it uses as much as digits as its factorization.

16950621521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 16950621521 in words is "sixteen billion, nine hundred fifty million, six hundred twenty-one thousand, five hundred twenty-one".