21111122100222 has 48 divisors (see below), whose sum is σ = 57027446716032. Its totient is φ = 5483408337360.

The previous prime is 21111122100199. The next prime is 21111122100223. The reversal of 21111122100222 is 22200122111112.

21111122100222 is a `hidden beast` number, since 211 + 1 + 11 + 221 + 0 + 0 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21111122100195 and 21111122100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111122100223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7615843528 + ... + 7615846299.

It is an arithmetic number, because the mean of its divisors is an integer number (1188071806584).

Almost surely, 2^{21111122100222} is an apocalyptic number.

21111122100222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21111122100222 is an abundant number, since it is smaller than the sum of its proper divisors (35916324615810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111122100222 is a wasteful number, since it uses less digits than its factorization.

21111122100222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15231689853 (or 15231689850 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21111122100222 its reverse (22200122111112), we get a palindrome (43311244211334).

The spelling of 21111122100222 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, one hundred thousand, two hundred twenty-two".