21612654536160 has 96 divisors (see below), whose sum is σ = 68186071592352. Its totient is φ = 5754383237120.

The previous prime is 21612654536093. The next prime is 21612654536171. The reversal of 21612654536160 is 6163545621612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34814289 + ... + 35429648.

It is an arithmetic number, because the mean of its divisors is an integer number (710271579087).

Almost surely, 2^{21612654536160} is an apocalyptic number.

21612654536160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21612654536160 is an abundant number, since it is smaller than the sum of its proper divisors (46573417056192).

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

21612654536160 is a wasteful number, since it uses less digits than its factorization.

21612654536160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70244596 (or 70244588 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 21612654536160 in words is "twenty-one trillion, six hundred twelve billion, six hundred fifty-four million, five hundred thirty-six thousand, one hundred sixty".