21242243452424 has 16 divisors (see below), whose sum is σ = 39830140122300. Its totient is φ = 10620872753152.

The previous prime is 21242243452421. The next prime is 21242243452433. The reversal of 21242243452424 is 42425434224212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20066081512324 + 1176161940100 = 4479518^2 + 1084510^2 .

It is a super-4 number, since 4×21242243452424⁴ (a number of 54 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21242243452421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30758777 + ... + 31441800.

Almost surely, 2^{21242243452424} is an apocalyptic number.

It is an amenable number.

21242243452424 is a deficient number, since it is larger than the sum of its proper divisors (18587896669876).

21242243452424 is a wasteful number, since it uses less digits than its factorization.

21242243452424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62243272 (or 62243268 counting only the distinct ones).

The product of its digits is 983040, while the sum is 41.

Adding to 21242243452424 its reverse (42425434224212), we get a palindrome (63667677676636).

The spelling of 21242243452424 in words is "twenty-one trillion, two hundred forty-two billion, two hundred forty-three million, four hundred fifty-two thousand, four hundred twenty-four".