21212102322 has 96 divisors (see below), whose sum is σ = 50247475200. Its totient is φ = 6444628704.

The previous prime is 21212102297. The next prime is 21212102339. The reversal of 21212102322 is 22320121212.

It is a super-3 number, since 3×21212102322³ (a number of 32 digits) contains 333 as substring.

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 = 21212102295 and 21212102304.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 937183 + ... + 959549.

It is an arithmetic number, because the mean of its divisors is an integer number (523411200).

Almost surely, 2^21212102322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21212102322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25123737600).

21212102322 is an abundant number, since it is smaller than the sum of its proper divisors (29035372878).

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

21212102322 is a wasteful number, since it uses less digits than its factorization.

21212102322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22500 (or 22497 counting only the distinct ones).

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

Adding to 21212102322 its reverse (22320121212), we get a palindrome (43532223534).

The spelling of 21212102322 in words is "twenty-one billion, two hundred twelve million, one hundred two thousand, three hundred twenty-two".