21200024242 has 16 divisors (see below), whose sum is σ = 32863941432. Its totient is φ = 10249953280.

The previous prime is 21200024227. The next prime is 21200024297. The reversal of 21200024242 is 24242000212.

It can be written as a sum of positive squares in 4 ways, for example, as 12091421521 + 9108602721 = 109961^2 + 95439^2 .

It is a super-2 number, since 2×21200024242² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1134703 + ... + 1153234.

Almost surely, 2^21200024242 is an apocalyptic number.

21200024242 is a deficient number, since it is larger than the sum of its proper divisors (11663917190).

21200024242 is a wasteful number, since it uses less digits than its factorization.

21200024242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288093.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21200024242 its reverse (24242000212), we get a palindrome (45442024454).

The spelling of 21200024242 in words is "twenty-one billion, two hundred million, twenty-four thousand, two hundred forty-two".