21364026555605 has 32 divisors (see below), whose sum is σ = 28034090972160. Its totient is φ = 15569565672960.

The previous prime is 21364026555593. The next prime is 21364026555611. The reversal of 21364026555605 is 50655562046312.

It is not a de Polignac number, because 21364026555605 - 2⁸ = 21364026555349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22640624 + ... + 23565353.

It is an arithmetic number, because the mean of its divisors is an integer number (876065342880).

Almost surely, 2^{21364026555605} is an apocalyptic number.

It is an amenable number.

21364026555605 is a deficient number, since it is larger than the sum of its proper divisors (6670064416555).

21364026555605 is a wasteful number, since it uses less digits than its factorization.

21364026555605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46206189.

The product of its (nonzero) digits is 6480000, while the sum is 50.

The spelling of 21364026555605 in words is "twenty-one trillion, three hundred sixty-four billion, twenty-six million, five hundred fifty-five thousand, six hundred five".