21033321212 has 12 divisors (see below), whose sum is σ = 36810716880. Its totient is φ = 10515973536.

The previous prime is 21033321209. The next prime is 21033321241. The reversal of 21033321212 is 21212333012.

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, 99512 + ... + 227967.

It is an arithmetic number, because the mean of its divisors is an integer number (3067559740).

Almost surely, 2^21033321212 is an apocalyptic number.

It is an amenable number.

21033321212 is a deficient number, since it is larger than the sum of its proper divisors (15777395668).

21033321212 is a wasteful number, since it uses less digits than its factorization.

21033321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343540 (or 343538 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21033321212 its reverse (21212333012), we get a palindrome (42245654224).

The spelling of 21033321212 in words is "twenty-one billion, thirty-three million, three hundred twenty-one thousand, two hundred twelve".