21233350042 has 4 divisors (see below), whose sum is σ = 31850025066. Its totient is φ = 10616675020.

The previous prime is 21233350031. The next prime is 21233350043. The reversal of 21233350042 is 24005333212.

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., 19901027041 + 1332323001 = 141071^2 + 36501^2 .

It is a super-2 number, since 2×21233350042² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233349989 and 21233350016.

It is not an unprimeable number, because it can be changed into a prime (21233350043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308337509 + ... + 5308337512.

Almost surely, 2^21233350042 is an apocalyptic number.

21233350042 is a deficient number, since it is larger than the sum of its proper divisors (10616675024).

21233350042 is a wasteful number, since it uses less digits than its factorization.

21233350042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616675023.

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21233350042 its reverse (24005333212), we get a palindrome (45238683254).

The spelling of 21233350042 in words is "twenty-one billion, two hundred thirty-three million, three hundred fifty thousand, forty-two".