21221201322112 has 32 divisors (see below), whose sum is σ = 46119940376400. Its totient is φ = 9646000600320.

The previous prime is 21221201322071. The next prime is 21221201322137. The reversal of 21221201322112 is 21122310212212.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7535936562 + ... + 7535939377.

Almost surely, 2^{21221201322112} is an apocalyptic number.

21221201322112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21221201322112 is an abundant number, since it is smaller than the sum of its proper divisors (24898739054288).

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

21221201322112 is a wasteful number, since it uses less digits than its factorization.

21221201322112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15071875964 (or 15071875952 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21221201322112 its reverse (21122310212212), we get a palindrome (42343511534324).

The spelling of 21221201322112 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, three hundred twenty-two thousand, one hundred twelve".