21310325055 has 48 divisors (see below), whose sum is σ = 38230807680. Its totient is φ = 10968082944.

The previous prime is 21310325041. The next prime is 21310325059. The reversal of 21310325055 is 55052301312.

It is a happy number.

21310325055 is a `hidden beast` number, since 21 + 310 + 325 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 21310325055 - 2¹² = 21310320959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310325059) 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 47 ways as a sum of consecutive naturals, for example, 4443739 + ... + 4448531.

It is an arithmetic number, because the mean of its divisors is an integer number (796475160).

Almost surely, 2^21310325055 is an apocalyptic number.

21310325055 is a deficient number, since it is larger than the sum of its proper divisors (16920482625).

21310325055 is a wasteful number, since it uses less digits than its factorization.

21310325055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8240 (or 8237 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

Adding to 21310325055 its reverse (55052301312), we get a palindrome (76362626367).

The spelling of 21310325055 in words is "twenty-one billion, three hundred ten million, three hundred twenty-five thousand, fifty-five".