21250320000 has 960 divisors, whose sum is σ = 88998386400. Its totient is φ = 4451328000.

The previous prime is 21250319999. The next prime is 21250320017. The reversal of 21250320000 is 2305212.

It is a tau number, because it is divible by the number of its divisors (960).

It is a super-2 number, since 2×21250320000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 152879931 + ... + 152880069.

Almost surely, 2^21250320000 is an apocalyptic number.

21250320000 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 21250320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44499193200).

21250320000 is an abundant number, since it is smaller than the sum of its proper divisors (67748066400).

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

21250320000 is a wasteful number, since it uses less digits than its factorization.

21250320000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

Adding to 21250320000 its reverse (2305212), we get a palindrome (21252625212).

The spelling of 21250320000 in words is "twenty-one billion, two hundred fifty million, three hundred twenty thousand".