21409008927 has 32 divisors (see below), whose sum is σ = 29415260160. Its totient is φ = 13845468000.

The previous prime is 21409008913. The next prime is 21409008997. The reversal of 21409008927 is 72980090412.

It is not a de Polignac number, because 21409008927 - 2⁷ = 21409008799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21409008997) 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 in 31 ways as a sum of consecutive naturals, for example, 5231152 + ... + 5235242.

It is an arithmetic number, because the mean of its divisors is an integer number (919226880).

Almost surely, 2^21409008927 is an apocalyptic number.

21409008927 is a deficient number, since it is larger than the sum of its proper divisors (8006251233).

21409008927 is a wasteful number, since it uses less digits than its factorization.

21409008927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 21409008927 in words is "twenty-one billion, four hundred nine million, eight thousand, nine hundred twenty-seven".