21203112320 has 128 divisors (see below), whose sum is σ = 57461292000. Its totient is φ = 7416741888.

The previous prime is 21203112233. The next prime is 21203112379. The reversal of 21203112320 is 2321130212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91016 + ... + 225144.

Almost surely, 2^21203112320 is an apocalyptic number.

21203112320 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 21203112320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28730646000).

21203112320 is an abundant number, since it is smaller than the sum of its proper divisors (36258179680).

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

21203112320 is a wasteful number, since it uses less digits than its factorization.

21203112320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134180 (or 134168 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21203112320 its reverse (2321130212), we get a palindrome (23524242532).

The spelling of 21203112320 in words is "twenty-one billion, two hundred three million, one hundred twelve thousand, three hundred twenty".