21221111121222 has 64 divisors (see below), whose sum is σ = 42784674177024. Its totient is φ = 7016896719360.

The previous prime is 21221111121157. The next prime is 21221111121227. The reversal of 21221111121222 is 22212111112212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221111121227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 508427538 + ... + 508469274.

It is an arithmetic number, because the mean of its divisors is an integer number (668510534016).

Almost surely, 2^{21221111121222} is an apocalyptic number.

21221111121222 is an abundant number, since it is smaller than the sum of its proper divisors (21563563055802).

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

21221111121222 is a wasteful number, since it uses less digits than its factorization.

21221111121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43333.

The product of its digits is 128, while the sum is 21.

Adding to 21221111121222 its reverse (22212111112212), we get a palindrome (43433222233434).

The spelling of 21221111121222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-two".