16221559927 has 2 divisors, whose sum is σ = 16221559928. Its totient is φ = 16221559926.

The previous prime is 16221559901. The next prime is 16221559967. The reversal of 16221559927 is 72995512261.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16221559927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16221559967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110779963 + 8110779964.

It is an arithmetic number, because the mean of its divisors is an integer number (8110779964).

Almost surely, 2^16221559927 is an apocalyptic number.

16221559927 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221559927 is an equidigital number, since it uses as much as digits as its factorization.

16221559927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 49.

The spelling of 16221559927 in words is "sixteen billion, two hundred twenty-one million, five hundred fifty-nine thousand, nine hundred twenty-seven".