21111122222222 has 8 divisors (see below), whose sum is σ = 32067527426400. Its totient is φ = 10421946413424.

The previous prime is 21111122222191. The next prime is 21111122222261. The reversal of 21111122222222 is 22222222111112.

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

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

21111122222222 is a modest number, since divided by 2222222 gives 2111112 as remainder.

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, 66807348647 + ... + 66807348962.

It is an arithmetic number, because the mean of its divisors is an integer number (4008440928300).

Almost surely, 2^{21111122222222} is an apocalyptic number.

21111122222222 is a deficient number, since it is larger than the sum of its proper divisors (10956405204178).

21111122222222 is a wasteful number, since it uses less digits than its factorization.

21111122222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133614697690.

The product of its digits is 512, while the sum is 23.

Adding to 21111122222222 its reverse (22222222111112), we get a palindrome (43333344333334).

It can be divided in two parts, 2111112 and 2222222, that added together give a palindrome (4333334).

The spelling of 21111122222222 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-two".