21253320000 has 560 divisors, whose sum is σ = 85221470400. Its totient is φ = 5149440000.

The previous prime is 21253319939. The next prime is 21253320001. The reversal of 21253320000 is 2335212.

It is a super-2 number, since 2×21253320000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253320001) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11879106 + ... + 11880894.

Almost surely, 2^21253320000 is an apocalyptic number.

21253320000 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 21253320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42610735200).

21253320000 is an abundant number, since it is smaller than the sum of its proper divisors (63968150400).

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

21253320000 is a wasteful number, since it uses less digits than its factorization.

21253320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841 (or 1810 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

Adding to 21253320000 its reverse (2335212), we get a palindrome (21255655212).

The spelling of 21253320000 in words is "twenty-one billion, two hundred fifty-three million, three hundred twenty thousand".