21000434231222 has 4 divisors (see below), whose sum is σ = 31500651346836. Its totient is φ = 10500217115610.

The previous prime is 21000434231221. The next prime is 21000434231267. The reversal of 21000434231222 is 22213243400012.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21000434231222² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000434231191 and 21000434231200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000434231221) by changing a digit.

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 as a sum of consecutive naturals, namely, 5250108557804 + ... + 5250108557807.

It is an arithmetic number, because the mean of its divisors is an integer number (7875162836709).

Almost surely, 2^{21000434231222} is an apocalyptic number.

21000434231222 is a deficient number, since it is larger than the sum of its proper divisors (10500217115614).

21000434231222 is a wasteful number, since it uses less digits than its factorization.

21000434231222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500217115613.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21000434231222 its reverse (22213243400012), we get a palindrome (43213677631234).

The spelling of 21000434231222 in words is "twenty-one trillion, four hundred thirty-four million, two hundred thirty-one thousand, two hundred twenty-two".