21600412042 has 12 divisors (see below), whose sum is σ = 35613902898. Its totient is φ = 9818369000.

The previous prime is 21600412037. The next prime is 21600412049. The reversal of 21600412042 is 24021400612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18279310401 + 3321101641 = 135201^2 + 57629^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21600412049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44628709 + ... + 44629192.

Almost surely, 2^21600412042 is an apocalyptic number.

21600412042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21600412042 is a deficient number, since it is larger than the sum of its proper divisors (14013490856).

21600412042 is a wasteful number, since it uses less digits than its factorization.

21600412042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89257925 (or 89257914 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21600412042 its reverse (24021400612), we get a palindrome (45621812654).

The spelling of 21600412042 in words is "twenty-one billion, six hundred million, four hundred twelve thousand, forty-two".