21039147360 has 960 divisors, whose sum is σ = 95896120320. Its totient is φ = 4215214080.

The previous prime is 21039147347. The next prime is 21039147361. The reversal of 21039147360 is 6374193012.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21039147361) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 28939317 + ... + 28940043.

It is an arithmetic number, because the mean of its divisors is an integer number (99891792).

Almost surely, 2^21039147360 is an apocalyptic number.

21039147360 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 21039147360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47948060160).

21039147360 is an abundant number, since it is smaller than the sum of its proper divisors (74856972960).

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

21039147360 is a wasteful number, since it uses less digits than its factorization.

21039147360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 21039147360 in words is "twenty-one billion, thirty-nine million, one hundred forty-seven thousand, three hundred sixty".