21243214204 has 12 divisors (see below), whose sum is σ = 37182045544. Its totient is φ = 10619772624.

The previous prime is 21243214199. The next prime is 21243214219. The reversal of 21243214204 is 40241234212.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 432399 + ... + 479014.

Almost surely, 2^21243214204 is an apocalyptic number.

It is an amenable number.

21243214204 is a deficient number, since it is larger than the sum of its proper divisors (15938831340).

21243214204 is a wasteful number, since it uses less digits than its factorization.

21243214204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917244 (or 917242 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21243214204 its reverse (40241234212), we get a palindrome (61484448416).

The spelling of 21243214204 in words is "twenty-one billion, two hundred forty-three million, two hundred fourteen thousand, two hundred four".