21110320212 has 12 divisors (see below), whose sum is σ = 49257413856. Its totient is φ = 7036773400.

The previous prime is 21110320211. The next prime is 21110320213. The reversal of 21110320212 is 21202301112.

It is an interprime number because it is at equal distance from previous prime (21110320211) and next prime (21110320213).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21110320191 and 21110320200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110320211) by changing a digit.

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, 879596664 + ... + 879596687.

It is an arithmetic number, because the mean of its divisors is an integer number (4104784488).

Almost surely, 2^21110320212 is an apocalyptic number.

It is an amenable number.

21110320212 is an abundant number, since it is smaller than the sum of its proper divisors (28147093644).

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

21110320212 is a wasteful number, since it uses less digits than its factorization.

21110320212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759193358 (or 1759193356 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21110320212 its reverse (21202301112), we get a palindrome (42312621324).

The spelling of 21110320212 in words is "twenty-one billion, one hundred ten million, three hundred twenty thousand, two hundred twelve".