21234040250 has 16 divisors (see below), whose sum is σ = 39750123816. Its totient is φ = 8493616000.

The previous prime is 21234040189. The next prime is 21234040301. The reversal of 21234040250 is 5204043212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5920225249 + 15313815001 = 76943^2 + 123749^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42467831 + ... + 42468330.

Almost surely, 2^21234040250 is an apocalyptic number.

21234040250 is a deficient number, since it is larger than the sum of its proper divisors (18516083566).

21234040250 is an equidigital number, since it uses as much as digits as its factorization.

21234040250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84936178 (or 84936168 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21234040250 its reverse (5204043212), we get a palindrome (26438083462).

The spelling of 21234040250 in words is "twenty-one billion, two hundred thirty-four million, forty thousand, two hundred fifty".