21422031312 has 80 divisors (see below), whose sum is σ = 60687544320. Its totient is φ = 6457507200.

The previous prime is 21422031299. The next prime is 21422031317. The reversal of 21422031312 is 21313022412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422031317) 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 15 ways as a sum of consecutive naturals, for example, 5362 + ... + 207057.

It is an arithmetic number, because the mean of its divisors is an integer number (758594304).

Almost surely, 2^21422031312 is an apocalyptic number.

21422031312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21422031312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30343772160).

21422031312 is an abundant number, since it is smaller than the sum of its proper divisors (39265513008).

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

21422031312 is a wasteful number, since it uses less digits than its factorization.

21422031312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212632 (or 212626 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21422031312 its reverse (21313022412), we get a palindrome (42735053724).

The spelling of 21422031312 in words is "twenty-one billion, four hundred twenty-two million, thirty-one thousand, three hundred twelve".