21202112222 has 8 divisors (see below), whose sum is σ = 32899829400. Its totient is φ = 10235502424.

The previous prime is 21202112221. The next prime is 21202112291. The reversal of 21202112222 is 22221120212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21202112222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202112221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182776772 + ... + 182776887.

It is an arithmetic number, because the mean of its divisors is an integer number (4112478675).

Almost surely, 2^21202112222 is an apocalyptic number.

21202112222 is a deficient number, since it is larger than the sum of its proper divisors (11697717178).

21202112222 is a wasteful number, since it uses less digits than its factorization.

21202112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365553690.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202112222 its reverse (22221120212), we get a palindrome (43423232434).

The spelling of 21202112222 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred twenty-two".