21111112222222 has 8 divisors (see below), whose sum is σ = 34545456363672. Its totient is φ = 9595960101000.

The previous prime is 21111112222169. The next prime is 21111112222241. The reversal of 21111112222222 is 22222221111112.

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

It is a super-2 number, since 2×21111112222222² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 959596010101 = 21111112222222 / (2 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 2 + 2 + 2 + 2 + 2 + 2).

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

It is a junction number, because it is equal to n+sod(n) for n = 21111112222193 and 21111112222202.

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, 479798005029 + ... + 479798005072.

It is an arithmetic number, because the mean of its divisors is an integer number (4318182045459).

Almost surely, 2^{21111112222222} is an apocalyptic number.

21111112222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111112222222 is a deficient number, since it is larger than the sum of its proper divisors (13434344141450).

21111112222222 is a wasteful number, since it uses less digits than its factorization.

21111112222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959596010114.

The product of its digits is 256, while the sum is 22.

Adding to 21111112222222 its reverse (22222221111112), we get a palindrome (43333333333334).

The spelling of 21111112222222 in words is "twenty-one trillion, one hundred eleven billion, one hundred twelve million, two hundred twenty-two thousand, two hundred twenty-two".