21403202242 has 4 divisors (see below), whose sum is σ = 32104803366. Its totient is φ = 10701601120.

The previous prime is 21403202239. The next prime is 21403202267. The reversal of 21403202242 is 24220230412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18495728001 + 2907474241 = 135999^2 + 53921^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350800559 + ... + 5350800562.

Almost surely, 2^21403202242 is an apocalyptic number.

21403202242 is a deficient number, since it is larger than the sum of its proper divisors (10701601124).

21403202242 is a wasteful number, since it uses less digits than its factorization.

21403202242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10701601123.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21403202242 its reverse (24220230412), we get a palindrome (45623432654).

The spelling of 21403202242 in words is "twenty-one billion, four hundred three million, two hundred two thousand, two hundred forty-two".