21222122202 has 16 divisors (see below), whose sum is σ = 47160271680. Its totient is φ = 7074040716.

The previous prime is 21222122191. The next prime is 21222122209. The reversal of 21222122202 is 20222122212.

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

It is not an unprimeable number, because it can be changed into a prime (21222122209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196501078 + ... + 196501185.

It is an arithmetic number, because the mean of its divisors is an integer number (2947516980).

Almost surely, 2^21222122202 is an apocalyptic number.

21222122202 is an abundant number, since it is smaller than the sum of its proper divisors (25938149478).

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

21222122202 is a wasteful number, since it uses less digits than its factorization.

21222122202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393002274 (or 393002268 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222122202 its reverse (20222122212), we get a palindrome (41444244414).

The spelling of 21222122202 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred two".