21215306342160 has 240 divisors, whose sum is σ = 85711964856960. Its totient is φ = 4593991127040.

The previous prime is 21215306342147. The next prime is 21215306342291. The reversal of 21215306342160 is 6124360351212.

21215306342160 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 5 + 3 + 0 + 634 + 2 + 16 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-3 number, since 3×21215306342160³ (a number of 41 digits) contains 333 as substring.

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 47 ways as a sum of consecutive naturals, for example, 110677561 + ... + 110869080.

It is an arithmetic number, because the mean of its divisors is an integer number (357133186904).

Almost surely, 2^{21215306342160} is an apocalyptic number.

21215306342160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21215306342160 is an abundant number, since it is smaller than the sum of its proper divisors (64496658514800).

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

21215306342160 is a wasteful number, since it uses less digits than its factorization.

21215306342160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221546686 (or 221546677 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 21215306342160 its reverse (6124360351212), we get a palindrome (27339666693372).

The spelling of 21215306342160 in words is "twenty-one trillion, two hundred fifteen billion, three hundred six million, three hundred forty-two thousand, one hundred sixty".