27216661420 has 96 divisors (see below), whose sum is σ = 63778337280. Its totient is φ = 9688135680.

The previous prime is 27216661363. The next prime is 27216661447. The reversal of 27216661420 is 2416661272.

It is a self number, because there is not a number n which added to its sum of digits gives 27216661420.

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 31 ways as a sum of consecutive naturals, for example, 2161864 + ... + 2174416.

It is an arithmetic number, because the mean of its divisors is an integer number (664357680).

Almost surely, 2^27216661420 is an apocalyptic number.

27216661420 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 27216661420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31889168640).

27216661420 is an abundant number, since it is smaller than the sum of its proper divisors (36561675860).

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

27216661420 is a wasteful number, since it uses less digits than its factorization.

27216661420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12875 (or 12873 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 27216661420 in words is "twenty-seven billion, two hundred sixteen million, six hundred sixty-one thousand, four hundred twenty".