21101112221222 has 32 divisors (see below), whose sum is σ = 36684994911264. Its totient is φ = 8996404134400.

The previous prime is 21101112221159. The next prime is 21101112221227. The reversal of 21101112221222 is 22212221110112.

It is a junction number, because it is equal to n+sod(n) for n = 21101112221194 and 21101112221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101112221227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96170429 + ... + 96389592.

It is an arithmetic number, because the mean of its divisors is an integer number (1146406090977).

Almost surely, 2^{21101112221222} is an apocalyptic number.

21101112221222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21101112221222 is a deficient number, since it is larger than the sum of its proper divisors (15583882690042).

21101112221222 is a wasteful number, since it uses less digits than its factorization.

21101112221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192560344.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21101112221222 its reverse (22212221110112), we get a palindrome (43313333331334).

The spelling of 21101112221222 in words is "twenty-one trillion, one hundred one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-two".