21224201243312 has 20 divisors (see below), whose sum is σ = 41122242118920. Its totient is φ = 10612009728768.

The previous prime is 21224201243299. The next prime is 21224201243359. The reversal of 21224201243312 is 21334210242212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3734153 + ... + 7509480.

It is an arithmetic number, because the mean of its divisors is an integer number (2056112105946).

Almost surely, 2^{21224201243312} is an apocalyptic number.

It is an amenable number.

21224201243312 is a deficient number, since it is larger than the sum of its proper divisors (19898040875608).

21224201243312 is a wasteful number, since it uses less digits than its factorization.

21224201243312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11361620 (or 11361614 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21224201243312 its reverse (21334210242212), we get a palindrome (42558411485524).

The spelling of 21224201243312 in words is "twenty-one trillion, two hundred twenty-four billion, two hundred one million, two hundred forty-three thousand, three hundred twelve".