21215484360 has 384 divisors, whose sum is σ = 86025139200. Its totient is φ = 4593749760.

The previous prime is 21215484359. The next prime is 21215484377. The reversal of 21215484360 is 6348451212.

It is a happy number.

21215484360 is a `hidden beast` number, since 2 + 1 + 215 + 4 + 8 + 436 + 0 = 666.

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

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, 1284555 + ... + 1300965.

It is an arithmetic number, because the mean of its divisors is an integer number (224023800).

Almost surely, 2^21215484360 is an apocalyptic number.

21215484360 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 21215484360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43012569600).

21215484360 is an abundant number, since it is smaller than the sum of its proper divisors (64809654840).

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

21215484360 is a wasteful number, since it uses less digits than its factorization.

21215484360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16463 (or 16447 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 21215484360 in words is "twenty-one billion, two hundred fifteen million, four hundred eighty-four thousand, three hundred sixty".