21310324420 has 288 divisors, whose sum is σ = 60026351616. Its totient is φ = 6274195200.

The previous prime is 21310324397. The next prime is 21310324447. The reversal of 21310324420 is 2442301312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21310324391 and 21310324400.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 14368999 + ... + 14370481.

It is an arithmetic number, because the mean of its divisors is an integer number (208424832).

Almost surely, 2^21310324420 is an apocalyptic number.

21310324420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21310324420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30013175808).

21310324420 is an abundant number, since it is smaller than the sum of its proper divisors (38716027196).

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

21310324420 is a wasteful number, since it uses less digits than its factorization.

21310324420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21310324420 its reverse (2442301312), we get a palindrome (23752625732).

The spelling of 21310324420 in words is "twenty-one billion, three hundred ten million, three hundred twenty-four thousand, four hundred twenty".