21221110122222 has 16 divisors (see below), whose sum is σ = 42460942027392. Its totient is φ = 7070583076920.

The previous prime is 21221110122221. The next prime is 21221110122323. The reversal of 21221110122222 is 22222101112212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221110122221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780059554 + ... + 780086757.

It is an arithmetic number, because the mean of its divisors is an integer number (2653808876712).

Almost surely, 2^{21221110122222} is an apocalyptic number.

21221110122222 is an abundant number, since it is smaller than the sum of its proper divisors (21239831905170).

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

21221110122222 is a wasteful number, since it uses less digits than its factorization.

21221110122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560148583.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21221110122222 its reverse (22222101112212), we get a palindrome (43443211234434).

The spelling of 21221110122222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred ten million, one hundred twenty-two thousand, two hundred twenty-two".