16265000021 has 2 divisors, whose sum is σ = 16265000022. Its totient is φ = 16265000020.

The previous prime is 16264999991. The next prime is 16265000033. The reversal of 16265000021 is 12000056261.

16265000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10098039121 + 6166960900 = 100489^2 + 78530^2 .

It is an emirp because it is prime and its reverse (12000056261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16265000021 - 2¹⁸ = 16264737877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16265000041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8132500010 + 8132500011.

It is an arithmetic number, because the mean of its divisors is an integer number (8132500011).

Almost surely, 2^16265000021 is an apocalyptic number.

It is an amenable number.

16265000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16265000021 is an equidigital number, since it uses as much as digits as its factorization.

16265000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 16265000021 its reverse (12000056261), we get a palindrome (28265056282).

The spelling of 16265000021 in words is "sixteen billion, two hundred sixty-five million, twenty-one", and thus it is an aban number.