21211100100222 has 32 divisors (see below), whose sum is σ = 42628040899200. Its totient is φ = 7036139982048.

The previous prime is 21211100100187. The next prime is 21211100100227. The reversal of 21211100100222 is 22200100111212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211100100227) 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, 8947972 + ... + 11067447.

It is an arithmetic number, because the mean of its divisors is an integer number (1332126278100).

Almost surely, 2^{21211100100222} is an apocalyptic number.

21211100100222 is an abundant number, since it is smaller than the sum of its proper divisors (21416940798978).

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

21211100100222 is a wasteful number, since it uses less digits than its factorization.

21211100100222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20016280.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211100100222 its reverse (22200100111212), we get a palindrome (43411200211434).

The spelling of 21211100100222 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, one hundred thousand, two hundred twenty-two".