16330516021 has 2 divisors, whose sum is σ = 16330516022. Its totient is φ = 16330516020.

The previous prime is 16330516019. The next prime is 16330516061. The reversal of 16330516021 is 12061503361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9079993521 + 7250522500 = 95289^2 + 85150^2 .

It is a cyclic number.

It is not a de Polignac number, because 16330516021 - 2¹ = 16330516019 is a prime.

Together with 16330516019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16330516061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8165258010 + 8165258011.

It is an arithmetic number, because the mean of its divisors is an integer number (8165258011).

Almost surely, 2^16330516021 is an apocalyptic number.

It is an amenable number.

16330516021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16330516021 is an equidigital number, since it uses as much as digits as its factorization.

16330516021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The spelling of 16330516021 in words is "sixteen billion, three hundred thirty million, five hundred sixteen thousand, twenty-one".