21655225312035 has 24 divisors (see below), whose sum is σ = 40305235684176. Its totient is φ = 9899531570880.

The previous prime is 21655225312001. The next prime is 21655225312051. The reversal of 21655225312035 is 53021352255612.

It is not a de Polignac number, because 21655225312035 - 2⁸ = 21655225311779 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14731445056 + ... + 14731446525.

It is an arithmetic number, because the mean of its divisors is an integer number (1679384820174).

Almost surely, 2^{21655225312035} is an apocalyptic number.

21655225312035 is a deficient number, since it is larger than the sum of its proper divisors (18650010372141).

21655225312035 is a wasteful number, since it uses less digits than its factorization.

21655225312035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29462891603 (or 29462891596 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 21655225312035 its reverse (53021352255612), we get a palindrome (74676577567647).

The spelling of 21655225312035 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twenty-five million, three hundred twelve thousand, thirty-five".