16804121947 has 2 divisors, whose sum is σ = 16804121948. Its totient is φ = 16804121946.

The previous prime is 16804121881. The next prime is 16804122001. The reversal of 16804121947 is 74912140861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16804121947 - 2¹⁹ = 16803597659 is a prime.

It is not a weakly prime, because it can be changed into another prime (16804127947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8402060973 + 8402060974.

It is an arithmetic number, because the mean of its divisors is an integer number (8402060974).

Almost surely, 2^16804121947 is an apocalyptic number.

16804121947 is a deficient number, since it is larger than the sum of its proper divisors (1).

16804121947 is an equidigital number, since it uses as much as digits as its factorization.

16804121947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 16804121947 in words is "sixteen billion, eight hundred four million, one hundred twenty-one thousand, nine hundred forty-seven".