21606630822 has 64 divisors (see below), whose sum is σ = 55005350400. Its totient is φ = 6158544480.

The previous prime is 21606630797. The next prime is 21606630823. The reversal of 21606630822 is 22803660612.

21606630822 is a `hidden beast` number, since 2 + 16 + 0 + 6 + 630 + 8 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606630823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90172 + ... + 226592.

It is an arithmetic number, because the mean of its divisors is an integer number (859458600).

Almost surely, 2^21606630822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21606630822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27502675200).

21606630822 is an abundant number, since it is smaller than the sum of its proper divisors (33398719578).

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

21606630822 is a wasteful number, since it uses less digits than its factorization.

21606630822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136858 (or 136852 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21606630822 in words is "twenty-one billion, six hundred six million, six hundred thirty thousand, eight hundred twenty-two".