16061399021 has 2 divisors, whose sum is σ = 16061399022. Its totient is φ = 16061399020.

The previous prime is 16061398981. The next prime is 16061399027. The reversal of 16061399021 is 12099316061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8889849796 + 7171549225 = 94286^2 + 84685^2 .

It is a cyclic number.

It is not a de Polignac number, because 16061399021 - 2⁶ = 16061398957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16061399027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8030699510 + 8030699511.

It is an arithmetic number, because the mean of its divisors is an integer number (8030699511).

Almost surely, 2^16061399021 is an apocalyptic number.

It is an amenable number.

16061399021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16061399021 is an equidigital number, since it uses as much as digits as its factorization.

16061399021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 16061399021 in words is "sixteen billion, sixty-one million, three hundred ninety-nine thousand, twenty-one".