21603217445255 has 32 divisors (see below), whose sum is σ = 27685207296000. Its totient is φ = 16146985680000.

The previous prime is 21603217445239. The next prime is 21603217445297. The reversal of 21603217445255 is 55254471230612.

It is not a de Polignac number, because 21603217445255 - 2⁴ = 21603217445239 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, 54872096 + ... + 55264394.

It is an arithmetic number, because the mean of its divisors is an integer number (865162728000).

Almost surely, 2^{21603217445255} is an apocalyptic number.

21603217445255 is a deficient number, since it is larger than the sum of its proper divisors (6081989850745).

21603217445255 is a wasteful number, since it uses less digits than its factorization.

21603217445255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404615.

The product of its (nonzero) digits is 2016000, while the sum is 47.

Adding to 21603217445255 its reverse (55254471230612), we get a palindrome (76857688675867).

The spelling of 21603217445255 in words is "twenty-one trillion, six hundred three billion, two hundred seventeen million, four hundred forty-five thousand, two hundred fifty-five".