21353322480 has 320 divisors, whose sum is σ = 77275054080. Its totient is φ = 4776809472.

The previous prime is 21353322467. The next prime is 21353322493. The reversal of 21353322480 is 8422335312.

It is an interprime number because it is at equal distance from previous prime (21353322467) and next prime (21353322493).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 36376747 + ... + 36377333.

It is an arithmetic number, because the mean of its divisors is an integer number (241484544).

Almost surely, 2^21353322480 is an apocalyptic number.

21353322480 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 21353322480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38637527040).

21353322480 is an abundant number, since it is smaller than the sum of its proper divisors (55921731600).

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

21353322480 is a wasteful number, since it uses less digits than its factorization.

21353322480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 21353322480 its reverse (8422335312), we get a palindrome (29775657792).

The spelling of 21353322480 in words is "twenty-one billion, three hundred fifty-three million, three hundred twenty-two thousand, four hundred eighty".