21655114884 has 96 divisors (see below), whose sum is σ = 60903440640. Its totient is φ = 6614417664.

The previous prime is 21655114861. The next prime is 21655114909. The reversal of 21655114884 is 48841155612.

21655114884 is a `hidden beast` number, since 2 + 1 + 6 + 551 + 14 + 8 + 84 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136057 + ... + 248639.

It is an arithmetic number, because the mean of its divisors is an integer number (634410840).

Almost surely, 2^21655114884 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 21655114884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30451720320).

21655114884 is an abundant number, since it is smaller than the sum of its proper divisors (39248325756).

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

21655114884 is a wasteful number, since it uses less digits than its factorization.

21655114884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112746 (or 112738 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The spelling of 21655114884 in words is "twenty-one billion, six hundred fifty-five million, one hundred fourteen thousand, eight hundred eighty-four".