21100222222 has 4 divisors (see below), whose sum is σ = 31650333336. Its totient is φ = 10550111110.

The previous prime is 21100222217. The next prime is 21100222223. The reversal of 21100222222 is 22222200112.

It is a semiprime because it is the product of two primes.

21100222222 is a modest number, since divided by 222222 gives 21100 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21100222196 and 21100222205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100222223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275055554 + ... + 5275055557.

It is an arithmetic number, because the mean of its divisors is an integer number (7912583334).

Almost surely, 2^21100222222 is an apocalyptic number.

21100222222 is a deficient number, since it is larger than the sum of its proper divisors (10550111114).

21100222222 is a wasteful number, since it uses less digits than its factorization.

21100222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550111113.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21100222222 its reverse (22222200112), we get a palindrome (43322422334).

The spelling of 21100222222 in words is "twenty-one billion, one hundred million, two hundred twenty-two thousand, two hundred twenty-two".