21221231231222 has 16 divisors (see below), whose sum is σ = 34725795910992. Its totient is φ = 9645973972320.

The previous prime is 21221231231203. The next prime is 21221231231227. The reversal of 21221231231222 is 22213213212212.

It is a super-2 number, since 2×21221231231222² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221231231191 and 21221231231200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221231231227) 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, 3751448 + ... + 7517700.

It is an arithmetic number, because the mean of its divisors is an integer number (2170362244437).

Almost surely, 2^{21221231231222} is an apocalyptic number.

21221231231222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221231231222 is a deficient number, since it is larger than the sum of its proper divisors (13504564679770).

21221231231222 is a wasteful number, since it uses less digits than its factorization.

21221231231222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022383.

The product of its digits is 2304, while the sum is 26.

Adding to 21221231231222 its reverse (22213213212212), we get a palindrome (43434444443434).

The spelling of 21221231231222 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-two".