21393039360 has 1344 divisors, whose sum is σ = 96819598080. Its totient is φ = 3963617280.

The previous prime is 21393039359. The next prime is 21393039403. The reversal of 21393039360 is 6393039312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1125949431 + ... + 1125949449.

Almost surely, 2^21393039360 is an apocalyptic number.

21393039360 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 21393039360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48409799040).

21393039360 is an abundant number, since it is smaller than the sum of its proper divisors (75426558720).

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

21393039360 is a wasteful number, since it uses less digits than its factorization.

21393039360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 39.

The spelling of 21393039360 in words is "twenty-one billion, three hundred ninety-three million, thirty-nine thousand, three hundred sixty".