21033300242 has 4 divisors (see below), whose sum is σ = 31549950366. Its totient is φ = 10516650120.

The previous prime is 21033300241. The next prime is 21033300247. The reversal of 21033300242 is 24200333012.

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., 20451574081 + 581726161 = 143009^2 + 24119^2 .

It is not an unprimeable number, because it can be changed into a prime (21033300241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5258325059 + ... + 5258325062.

Almost surely, 2^21033300242 is an apocalyptic number.

21033300242 is a deficient number, since it is larger than the sum of its proper divisors (10516650124).

21033300242 is a wasteful number, since it uses less digits than its factorization.

21033300242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10516650123.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21033300242 its reverse (24200333012), we get a palindrome (45233633254).

The spelling of 21033300242 in words is "twenty-one billion, thirty-three million, three hundred thousand, two hundred forty-two".