21322021312 has 56 divisors (see below), whose sum is σ = 44573535440. Its totient is φ = 10091796480.

The previous prime is 21322021283. The next prime is 21322021337. The reversal of 21322021312 is 21312022312.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21322021312.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1672948 + ... + 1685644.

It is an arithmetic number, because the mean of its divisors is an integer number (795955990).

Almost surely, 2^21322021312 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 21322021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22286767720).

21322021312 is an abundant number, since it is smaller than the sum of its proper divisors (23251514128).

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

21322021312 is a wasteful number, since it uses less digits than its factorization.

21322021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14109 (or 14099 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21322021312 its reverse (21312022312), we get a palindrome (42634043624).

The spelling of 21322021312 in words is "twenty-one billion, three hundred twenty-two million, twenty-one thousand, three hundred twelve".