21300221212 has 24 divisors (see below), whose sum is σ = 38100170304. Its totient is φ = 10414835712.

The previous prime is 21300221209. The next prime is 21300221221. The reversal of 21300221212 is 21212200312.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 182248 + ... + 275344.

It is an arithmetic number, because the mean of its divisors is an integer number (1587507096).

Almost surely, 2^21300221212 is an apocalyptic number.

It is an amenable number.

21300221212 is a deficient number, since it is larger than the sum of its proper divisors (16799949092).

21300221212 is a wasteful number, since it uses less digits than its factorization.

21300221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94365 (or 94363 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21300221212 its reverse (21212200312), we get a palindrome (42512421524).

The spelling of 21300221212 in words is "twenty-one billion, three hundred million, two hundred twenty-one thousand, two hundred twelve".