21350552000 has 112 divisors (see below), whose sum is σ = 53620781760. Its totient is φ = 8419712000.

The previous prime is 21350551979. The next prime is 21350552009. The reversal of 21350552000 is 25505312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350552009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 549206 + ... + 586794.

It is an arithmetic number, because the mean of its divisors is an integer number (478756980).

Almost surely, 2^21350552000 is an apocalyptic number.

21350552000 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 21350552000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26810390880).

21350552000 is an abundant number, since it is smaller than the sum of its proper divisors (32270229760).

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

21350552000 is an equidigital number, since it uses as much as digits as its factorization.

21350552000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37687 (or 37667 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The spelling of 21350552000 in words is "twenty-one billion, three hundred fifty million, five hundred fifty-two thousand".