21211221011222 has 16 divisors (see below), whose sum is σ = 34714458442944. Its totient is φ = 9640023069000.

The previous prime is 21211221011203. The next prime is 21211221011297. The reversal of 21211221011222 is 22211012211212.

It is a junction number, because it is equal to n+sod(n) for n = 21211221011194 and 21211221011203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71900804 + ... + 72195207.

It is an arithmetic number, because the mean of its divisors is an integer number (2169653652684).

Almost surely, 2^{21211221011222} is an apocalyptic number.

21211221011222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211221011222 is a deficient number, since it is larger than the sum of its proper divisors (13503237431722).

21211221011222 is a wasteful number, since it uses less digits than its factorization.

21211221011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144102715.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21211221011222 its reverse (22211012211212), we get a palindrome (43422233222434).

The spelling of 21211221011222 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, eleven thousand, two hundred twenty-two".