21313352480 has 192 divisors, whose sum is σ = 59115184128. Its totient is φ = 7109544960.

The previous prime is 21313352453. The next prime is 21313352491. The reversal of 21313352480 is 8425331312.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14977049 + ... + 14978471.

It is an arithmetic number, because the mean of its divisors is an integer number (307891584).

Almost surely, 2^21313352480 is an apocalyptic number.

21313352480 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 21313352480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29557592064).

21313352480 is an abundant number, since it is smaller than the sum of its proper divisors (37801831648).

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

21313352480 is a wasteful number, since it uses less digits than its factorization.

21313352480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799 (or 1791 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 21313352480 its reverse (8425331312), we get a palindrome (29738683792).

The spelling of 21313352480 in words is "twenty-one billion, three hundred thirteen million, three hundred fifty-two thousand, four hundred eighty".