21627995328 has 308 divisors, whose sum is σ = 66142773480. Its totient is φ = 7014076416.

The previous prime is 21627995327. The next prime is 21627995353. The reversal of 21627995328 is 82359972612.

21627995328 is a `hidden beast` number, since 2 + 1 + 627 + 9 + 9 + 5 + 3 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21627995327) by changing a digit.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 222968976 + ... + 222969072.

Almost surely, 2^21627995328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21627995328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33071386740).

21627995328 is an abundant number, since it is smaller than the sum of its proper divisors (44514778152).

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

21627995328 is an frugal number, since it uses more digits than its factorization.

21627995328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 161 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 21627995328 in words is "twenty-one billion, six hundred twenty-seven million, nine hundred ninety-five thousand, three hundred twenty-eight".