21313255224 has 32 divisors (see below), whose sum is σ = 53800456320. Its totient is φ = 7035442656.

The previous prime is 21313255219. The next prime is 21313255231. The reversal of 21313255224 is 42255231312.

It is a junction number, because it is equal to n+sod(n) for n = 21313255191 and 21313255200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4308462 + ... + 4313405.

It is an arithmetic number, because the mean of its divisors is an integer number (1681264260).

Almost surely, 2^21313255224 is an apocalyptic number.

21313255224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21313255224 is an abundant number, since it is smaller than the sum of its proper divisors (32487201096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21313255224 is a wasteful number, since it uses less digits than its factorization.

21313255224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8621979 (or 8621975 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

Adding to 21313255224 its reverse (42255231312), we get a palindrome (63568486536).

The spelling of 21313255224 in words is "twenty-one billion, three hundred thirteen million, two hundred fifty-five thousand, two hundred twenty-four".