21326772224 has 96 divisors (see below), whose sum is σ = 45221904000. Its totient is φ = 10026934272.

The previous prime is 21326772197. The next prime is 21326772227. The reversal of 21326772224 is 42227762312.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326772227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5406797 + ... + 5410739.

It is an arithmetic number, because the mean of its divisors is an integer number (471061500).

Almost surely, 2^21326772224 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 21326772224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22610952000).

21326772224 is an abundant number, since it is smaller than the sum of its proper divisors (23895131776).

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

21326772224 is a wasteful number, since it uses less digits than its factorization.

21326772224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4123 (or 4103 counting only the distinct ones).

The product of its digits is 112896, while the sum is 38.

The spelling of 21326772224 in words is "twenty-one billion, three hundred twenty-six million, seven hundred seventy-two thousand, two hundred twenty-four".