21389288000 has 224 divisors, whose sum is σ = 56313628800. Its totient is φ = 8024832000.

The previous prime is 21389287993. The next prime is 21389288017. The reversal of 21389288000 is 88298312.

It is a happy number.

It is a super-2 number, since 2×21389288000² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16567355 + ... + 16568645.

Almost surely, 2^21389288000 is an apocalyptic number.

21389288000 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 21389288000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28156814400).

21389288000 is an abundant number, since it is smaller than the sum of its proper divisors (34924340800).

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

21389288000 is a wasteful number, since it uses less digits than its factorization.

21389288000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446 (or 1426 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 21389288000 in words is "twenty-one billion, three hundred eighty-nine million, two hundred eighty-eight thousand".