16000010021 has 2 divisors, whose sum is σ = 16000010022. Its totient is φ = 16000010020.

The previous prime is 16000009957. The next prime is 16000010023. The reversal of 16000010021 is 12001000061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10944088996 + 5055921025 = 104614^2 + 71105^2 .

It is a cyclic number.

It is not a de Polignac number, because 16000010021 - 2⁶ = 16000009957 is a prime.

Together with 16000010023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16000009984 and 16000010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16000010023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8000005010 + 8000005011.

It is an arithmetic number, because the mean of its divisors is an integer number (8000005011).

Almost surely, 2^16000010021 is an apocalyptic number.

It is an amenable number.

16000010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16000010021 is an equidigital number, since it uses as much as digits as its factorization.

16000010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 16000010021 its reverse (12001000061), we get a palindrome (28001010082).

The spelling of 16000010021 in words is "sixteen billion, ten thousand, twenty-one".