21442303212 has 96 divisors (see below), whose sum is σ = 55646438400. Its totient is φ = 6371323200.

The previous prime is 21442303189. The next prime is 21442303217. The reversal of 21442303212 is 21230324412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21442303217) 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, 3259887 + ... + 3266457.

It is an arithmetic number, because the mean of its divisors is an integer number (579650400).

Almost surely, 2^21442303212 is an apocalyptic number.

21442303212 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 21442303212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27823219200).

21442303212 is an abundant number, since it is smaller than the sum of its proper divisors (34204135188).

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

21442303212 is a wasteful number, since it uses less digits than its factorization.

21442303212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067 (or 7065 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21442303212 its reverse (21230324412), we get a palindrome (42672627624).

The spelling of 21442303212 in words is "twenty-one billion, four hundred forty-two million, three hundred three thousand, two hundred twelve".