21221110222222 has 8 divisors (see below), whose sum is σ = 31831948862856. Its totient is φ = 10610460601272.

The previous prime is 21221110222183. The next prime is 21221110222231. The reversal of 21221110222222 is 22222201112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21221110222193 and 21221110222202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46973913 + ... + 47423524.

It is an arithmetic number, because the mean of its divisors is an integer number (3978993607857).

Almost surely, 2^{21221110222222} is an apocalyptic number.

21221110222222 is a deficient number, since it is larger than the sum of its proper divisors (10610838640634).

21221110222222 is a wasteful number, since it uses less digits than its factorization.

21221110222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94509842.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21221110222222 its reverse (22222201112212), we get a palindrome (43443311334434).

The spelling of 21221110222222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred ten million, two hundred twenty-two thousand, two hundred twenty-two".