21322312242 has 128 divisors (see below), whose sum is σ = 55836684288. Its totient is φ = 5263315200.

The previous prime is 21322312223. The next prime is 21322312267. The reversal of 21322312242 is 24221322312.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1661892 + ... + 1674672.

It is an arithmetic number, because the mean of its divisors is an integer number (436224096).

Almost surely, 2^21322312242 is an apocalyptic number.

21322312242 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 21322312242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27918342144).

21322312242 is an abundant number, since it is smaller than the sum of its proper divisors (34514372046).

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

21322312242 is a wasteful number, since it uses less digits than its factorization.

21322312242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12984.

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

Adding to 21322312242 its reverse (24221322312), we get a palindrome (45543634554).

The spelling of 21322312242 in words is "twenty-one billion, three hundred twenty-two million, three hundred twelve thousand, two hundred forty-two".