21011222222 has 8 divisors (see below), whose sum is σ = 32533505472. Its totient is φ = 10166720400.

The previous prime is 21011222213. The next prime is 21011222279. The reversal of 21011222222 is 22222211012.

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 21011222222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169445279 + ... + 169445402.

It is an arithmetic number, because the mean of its divisors is an integer number (4066688184).

Almost surely, 2^21011222222 is an apocalyptic number.

21011222222 is a deficient number, since it is larger than the sum of its proper divisors (11522283250).

21011222222 is a wasteful number, since it uses less digits than its factorization.

21011222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338890714.

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

Adding to 21011222222 its reverse (22222211012), we get a palindrome (43233433234).

The spelling of 21011222222 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, two hundred twenty-two".