21320554080 has 768 divisors, whose sum is σ = 85854504960. Its totient is φ = 4335206400.

The previous prime is 21320554039. The next prime is 21320554091. The reversal of 21320554080 is 8045502312.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 127 ways as a sum of consecutive naturals, for example, 101045175 + ... + 101045385.

It is an arithmetic number, because the mean of its divisors is an integer number (111789720).

Almost surely, 2^21320554080 is an apocalyptic number.

21320554080 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 21320554080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42927252480).

21320554080 is an abundant number, since it is smaller than the sum of its proper divisors (64533950880).

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

21320554080 is a wasteful number, since it uses less digits than its factorization.

21320554080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 21320554080 in words is "twenty-one billion, three hundred twenty million, five hundred fifty-four thousand, eighty".