21395415395409 has 8 divisors (see below), whose sum is σ = 31120604211552. Its totient is φ = 12966918421440.

The previous prime is 21395415395359. The next prime is 21395415395429. The reversal of 21395415395409 is 90459351459312.

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

It is not a de Polignac number, because 21395415395409 - 2¹² = 21395415391313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21395415395429) 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 7 ways as a sum of consecutive naturals, for example, 324172960504 + ... + 324172960569.

It is an arithmetic number, because the mean of its divisors is an integer number (3890075526444).

Almost surely, 2^{21395415395409} is an apocalyptic number.

It is an amenable number.

21395415395409 is a deficient number, since it is larger than the sum of its proper divisors (9725188816143).

21395415395409 is a wasteful number, since it uses less digits than its factorization.

21395415395409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648345921087.

The product of its (nonzero) digits is 26244000, while the sum is 60.

The spelling of 21395415395409 in words is "twenty-one trillion, three hundred ninety-five billion, four hundred fifteen million, three hundred ninety-five thousand, four hundred nine".