21305211204 has 24 divisors (see below), whose sum is σ = 50868257440. Its totient is φ = 6936580224.

The previous prime is 21305211199. The next prime is 21305211211. The reversal of 21305211204 is 40211250312.

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 7 ways as a sum of consecutive naturals, for example, 20644069 + ... + 20645100.

Almost surely, 2^21305211204 is an apocalyptic number.

It is an amenable number.

21305211204 is an abundant number, since it is smaller than the sum of its proper divisors (29563046236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21305211204 is a wasteful number, since it uses less digits than its factorization.

21305211204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41289219 (or 41289217 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21305211204 its reverse (40211250312), we get a palindrome (61516461516).

The spelling of 21305211204 in words is "twenty-one billion, three hundred five million, two hundred eleven thousand, two hundred four".