21738879360 has 768 divisors, whose sum is σ = 87223953600. Its totient is φ = 5109350400.

The previous prime is 21738879313. The next prime is 21738879401. The reversal of 21738879360 is 6397883712.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 21738879297 and 21738879306.

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, 77362420 + ... + 77362700.

Almost surely, 2^21738879360 is an apocalyptic number.

21738879360 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 21738879360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43611976800).

21738879360 is an abundant number, since it is smaller than the sum of its proper divisors (65485074240).

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

21738879360 is a wasteful number, since it uses less digits than its factorization.

21738879360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 21738879360 in words is "twenty-one billion, seven hundred thirty-eight million, eight hundred seventy-nine thousand, three hundred sixty".