21100202222 has 16 divisors (see below), whose sum is σ = 36558639792. Its totient is φ = 9026824320.

The previous prime is 21100202177. The next prime is 21100202257. The reversal of 21100202222 is 22220200112.

It is a junction number, because it is equal to n+sod(n) for n = 21100202197 and 21100202206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28208453 + ... + 28209200.

It is an arithmetic number, because the mean of its divisors is an integer number (2284914987).

Almost surely, 2^21100202222 is an apocalyptic number.

21100202222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21100202222 is a deficient number, since it is larger than the sum of its proper divisors (15458437570).

21100202222 is a wasteful number, since it uses less digits than its factorization.

21100202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56417683.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21100202222 its reverse (22220200112), we get a palindrome (43320402334).

It can be divided in two parts, 21100 and 202222, that added together give a palindrome (223322).

The spelling of 21100202222 in words is "twenty-one billion, one hundred million, two hundred two thousand, two hundred twenty-two".