21223420231442 has 48 divisors (see below), whose sum is σ = 37758089620440. Its totient is φ = 8887435941120.

The previous prime is 21223420231421. The next prime is 21223420231471. The reversal of 21223420231442 is 24413202432212.

It can be written as a sum of positive squares in 4 ways, for example, as 10845686571841 + 10377733659601 = 3293279^2 + 3221449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21223420231399 and 21223420231408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5025563 + ... + 8228190.

Almost surely, 2^{21223420231442} is an apocalyptic number.

21223420231442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21223420231442 is a deficient number, since it is larger than the sum of its proper divisors (16534669388998).

21223420231442 is a wasteful number, since it uses less digits than its factorization.

21223420231442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13254299 (or 13254288 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21223420231442 its reverse (24413202432212), we get a palindrome (45636622663654).

The spelling of 21223420231442 in words is "twenty-one trillion, two hundred twenty-three billion, four hundred twenty million, two hundred thirty-one thousand, four hundred forty-two".