21655225163350 has 12 divisors (see below), whose sum is σ = 40278718803924. Its totient is φ = 8662090065320.

The previous prime is 21655225163311. The next prime is 21655225163359. The reversal of 21655225163350 is 5336152255612.

It is a self number, because there is not a number n which added to its sum of digits gives 21655225163350.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655225163359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216552251584 + ... + 216552251683.

It is an arithmetic number, because the mean of its divisors is an integer number (3356559900327).

Almost surely, 2^{21655225163350} is an apocalyptic number.

21655225163350 is a deficient number, since it is larger than the sum of its proper divisors (18623493640574).

21655225163350 is a wasteful number, since it uses less digits than its factorization.

21655225163350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433104503279 (or 433104503274 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 46.

The spelling of 21655225163350 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twenty-five million, one hundred sixty-three thousand, three hundred fifty".