21320063380 has 192 divisors, whose sum is σ = 58360135680. Its totient is φ = 6348326400.

The previous prime is 21320063363. The next prime is 21320063461. The reversal of 21320063380 is 8336002312.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3768634 + ... + 3774286.

It is an arithmetic number, because the mean of its divisors is an integer number (303959040).

Almost surely, 2^21320063380 is an apocalyptic number.

21320063380 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 21320063380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29180067840).

21320063380 is an abundant number, since it is smaller than the sum of its proper divisors (37040072300).

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

21320063380 is a wasteful number, since it uses less digits than its factorization.

21320063380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5790 (or 5788 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 21320063380 its reverse (8336002312), we get a palindrome (29656065692).

The spelling of 21320063380 in words is "twenty-one billion, three hundred twenty million, sixty-three thousand, three hundred eighty".