21409580805 has 8 divisors (see below), whose sum is σ = 34255329312. Its totient is φ = 11418443088.

The previous prime is 21409580791. The next prime is 21409580839. The reversal of 21409580805 is 50808590412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21409580805 - 2⁴ = 21409580789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713652679 + ... + 713652708.

It is an arithmetic number, because the mean of its divisors is an integer number (4281916164).

Almost surely, 2^21409580805 is an apocalyptic number.

It is an amenable number.

21409580805 is a deficient number, since it is larger than the sum of its proper divisors (12845748507).

21409580805 is a wasteful number, since it uses less digits than its factorization.

21409580805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427305395.

The product of its (nonzero) digits is 115200, while the sum is 42.

The spelling of 21409580805 in words is "twenty-one billion, four hundred nine million, five hundred eighty thousand, eight hundred five".