21050455320 has 96 divisors (see below), whose sum is σ = 68476215600. Its totient is φ = 5608348416.

The previous prime is 21050455303. The next prime is 21050455351. The reversal of 21050455320 is 2355405012.

It is a happy number.

21050455320 is a `hidden beast` number, since 2 + 105 + 0 + 4 + 553 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 378246 + ... + 430314.

Almost surely, 2^21050455320 is an apocalyptic number.

21050455320 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 21050455320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34238107800).

21050455320 is an abundant number, since it is smaller than the sum of its proper divisors (47425760280).

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

21050455320 is a wasteful number, since it uses less digits than its factorization.

21050455320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53209 (or 53202 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The spelling of 21050455320 in words is "twenty-one billion, fifty million, four hundred fifty-five thousand, three hundred twenty".