16380021121 has 2 divisors, whose sum is σ = 16380021122. Its totient is φ = 16380021120.

The previous prime is 16380021079. The next prime is 16380021173. The reversal of 16380021121 is 12112008361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8347380496 + 8032640625 = 91364^2 + 89625^2 .

It is an emirp because it is prime and its reverse (12112008361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16380021121 - 2⁹ = 16380020609 is a prime.

It is not a weakly prime, because it can be changed into another prime (16380021221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8190010560 + 8190010561.

It is an arithmetic number, because the mean of its divisors is an integer number (8190010561).

Almost surely, 2^16380021121 is an apocalyptic number.

It is an amenable number.

16380021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16380021121 is an equidigital number, since it uses as much as digits as its factorization.

16380021121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 16380021121 its reverse (12112008361), we get a palindrome (28492029482).

The spelling of 16380021121 in words is "sixteen billion, three hundred eighty million, twenty-one thousand, one hundred twenty-one".