21211220110222 has 16 divisors (see below), whose sum is σ = 33762885367680. Its totient is φ = 9972555953272.

The previous prime is 21211220110183. The next prime is 21211220110243. The reversal of 21211220110222 is 22201102211212.

It is a self number, because there is not a number n which added to its sum of digits gives 21211220110222.

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, 3907738648 + ... + 3907744075.

It is an arithmetic number, because the mean of its divisors is an integer number (2110180335480).

Almost surely, 2^{21211220110222} is an apocalyptic number.

21211220110222 is a deficient number, since it is larger than the sum of its proper divisors (12551665257458).

21211220110222 is a wasteful number, since it uses less digits than its factorization.

21211220110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7815482807.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211220110222 its reverse (22201102211212), we get a palindrome (43412322321434).

The spelling of 21211220110222 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty million, one hundred ten thousand, two hundred twenty-two".