21612206160 has 240 divisors, whose sum is σ = 77306052096. Its totient is φ = 5607304704.

The previous prime is 21612206159. The next prime is 21612206173. The reversal of 21612206160 is 6160221612.

21612206160 is a `hidden beast` number, since 2 + 16 + 12 + 20 + 616 + 0 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 704257 + ... + 734303.

Almost surely, 2^21612206160 is an apocalyptic number.

21612206160 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 21612206160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38653026048).

21612206160 is an abundant number, since it is smaller than the sum of its proper divisors (55693845936).

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

21612206160 is a wasteful number, since it uses less digits than its factorization.

21612206160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30112 (or 30094 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 21612206160 its reverse (6160221612), we get a palindrome (27772427772).

The spelling of 21612206160 in words is "twenty-one billion, six hundred twelve million, two hundred six thousand, one hundred sixty".