21022100222222 has 16 divisors (see below), whose sum is σ = 34402972119552. Its totient is φ = 9554619057720.

The previous prime is 21022100222171. The next prime is 21022100222239. The reversal of 21022100222222 is 22222200122012.

It is a junction number, because it is equal to n+sod(n) for n = 21022100222194 and 21022100222203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43808108 + ... + 44285375.

It is an arithmetic number, because the mean of its divisors is an integer number (2150185757472).

Almost surely, 2^{21022100222222} is an apocalyptic number.

21022100222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21022100222222 is a deficient number, since it is larger than the sum of its proper divisors (13380871897330).

21022100222222 is a wasteful number, since it uses less digits than its factorization.

21022100222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88104343.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21022100222222 its reverse (22222200122012), we get a palindrome (43244300344234).

The spelling of 21022100222222 in words is "twenty-one trillion, twenty-two billion, one hundred million, two hundred twenty-two thousand, two hundred twenty-two".