21213240050 has 24 divisors (see below), whose sum is σ = 41777606196. Its totient is φ = 7986160640.

The previous prime is 21213240049. The next prime is 21213240053. The reversal of 21213240050 is 5004231212.

It can be written as a sum of positive squares in 6 ways, for example, as 14726065201 + 6487174849 = 121351^2 + 80543^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21213240053) 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 in 11 ways as a sum of consecutive naturals, for example, 12477527 + ... + 12479226.

Almost surely, 2^21213240050 is an apocalyptic number.

21213240050 is a deficient number, since it is larger than the sum of its proper divisors (20564366146).

21213240050 is a wasteful number, since it uses less digits than its factorization.

21213240050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24956782 (or 24956777 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21213240050 its reverse (5004231212), we get a palindrome (26217471262).

The spelling of 21213240050 in words is "twenty-one billion, two hundred thirteen million, two hundred forty thousand, fifty".