21723333522 has 64 divisors (see below), whose sum is σ = 47944407168. Its totient is φ = 6561297600.

The previous prime is 21723333521. The next prime is 21723333547. The reversal of 21723333522 is 22533332712.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21723333521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2527272 + ... + 2535852.

It is an arithmetic number, because the mean of its divisors is an integer number (749131362).

Almost surely, 2^21723333522 is an apocalyptic number.

21723333522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21723333522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23972203584).

21723333522 is an abundant number, since it is smaller than the sum of its proper divisors (26221073646).

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

21723333522 is a wasteful number, since it uses less digits than its factorization.

21723333522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8936 (or 8914 counting only the distinct ones).

The product of its digits is 45360, while the sum is 33.

The spelling of 21723333522 in words is "twenty-one billion, seven hundred twenty-three million, three hundred thirty-three thousand, five hundred twenty-two".