21202321122 has 96 divisors (see below), whose sum is σ = 49745404800. Its totient is φ = 6503721984.

The previous prime is 21202321099. The next prime is 21202321123. The reversal of 21202321122 is 22112320212.

21202321122 is a `hidden beast` number, since 21 + 202 + 321 + 122 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21202321095 and 21202321104.

It is not an unprimeable number, because it can be changed into a prime (21202321123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11223154 + ... + 11225042.

It is an arithmetic number, because the mean of its divisors is an integer number (518181300).

Almost surely, 2^21202321122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202321122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24872702400).

21202321122 is an abundant number, since it is smaller than the sum of its proper divisors (28543083678).

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

21202321122 is a wasteful number, since it uses less digits than its factorization.

21202321122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840 (or 2837 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21202321122 its reverse (22112320212), we get a palindrome (43314641334).

The spelling of 21202321122 in words is "twenty-one billion, two hundred two million, three hundred twenty-one thousand, one hundred twenty-two".