21211112222 has 8 divisors (see below), whose sum is σ = 31841090256. Its totient is φ = 10597415472.

The previous prime is 21211112207. The next prime is 21211112231. The reversal of 21211112222 is 22221111212.

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

It is a super-2 number, since 2×21211112222² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21211112222.

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, 4067063 + ... + 4072274.

It is an arithmetic number, because the mean of its divisors is an integer number (3980136282).

Almost surely, 2^21211112222 is an apocalyptic number.

21211112222 is a deficient number, since it is larger than the sum of its proper divisors (10629978034).

21211112222 is a wasteful number, since it uses less digits than its factorization.

21211112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8140642.

The product of its digits is 64, while the sum is 17.

Adding to 21211112222 its reverse (22221111212), we get a palindrome (43432223434).

The spelling of 21211112222 in words is "twenty-one billion, two hundred eleven million, one hundred twelve thousand, two hundred twenty-two".