4409999999921 has 2 divisors, whose sum is σ = 4409999999922. Its totient is φ = 4409999999920.

The previous prime is 4409999999843. The next prime is 4410000000011. The reversal of 4409999999921 is 1299999999044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4170433802896 + 239566197025 = 2042164^2 + 489455^2 .

It is a cyclic number.

It is not a de Polignac number, because 4409999999921 - 2²² = 4409995805617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4409999999921.

It is not a weakly prime, because it can be changed into another prime (4409999959921) 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, 2204999999960 + 2204999999961.

It is an arithmetic number, because the mean of its divisors is an integer number (2204999999961).

Almost surely, 2^{4409999999921} is an apocalyptic number.

It is an amenable number.

4409999999921 is a deficient number, since it is larger than the sum of its proper divisors (1).

4409999999921 is an equidigital number, since it uses as much as digits as its factorization.

4409999999921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1377495072, while the sum is 83.

The spelling of 4409999999921 in words is "four trillion, four hundred nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-one".