21033410842 has 8 divisors (see below), whose sum is σ = 31550829300. Its totient is φ = 10516467744.

The previous prime is 21033410821. The next prime is 21033410843. The reversal of 21033410842 is 24801433012.

It is a Cunningham number, because it is equal to 145029²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 21033410841 + 1 = 145029^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21033410842.

It is not an unprimeable number, because it can be changed into a prime (21033410843) 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, 28134 + ... + 207022.

Almost surely, 2^21033410842 is an apocalyptic number.

21033410842 is a deficient number, since it is larger than the sum of its proper divisors (10517418458).

21033410842 is a wasteful number, since it uses less digits than its factorization.

21033410842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237680.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21033410842 its reverse (24801433012), we get a palindrome (45834843854).

The spelling of 21033410842 in words is "twenty-one billion, thirty-three million, four hundred ten thousand, eight hundred forty-two".