21633022650 has 72 divisors (see below), whose sum is σ = 54927288000. Its totient is φ = 5634575520.

The previous prime is 21633022637. The next prime is 21633022681. The reversal of 21633022650 is 5622033612.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 35 ways as a sum of consecutive naturals, for example, 238351 + ... + 316349.

It is an arithmetic number, because the mean of its divisors is an integer number (762879000).

Almost surely, 2^21633022650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21633022650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27463644000).

21633022650 is an abundant number, since it is smaller than the sum of its proper divisors (33294265350).

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

21633022650 is a wasteful number, since it uses less digits than its factorization.

21633022650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78100 (or 78052 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The spelling of 21633022650 in words is "twenty-one billion, six hundred thirty-three million, twenty-two thousand, six hundred fifty".