21321102112 has 48 divisors (see below), whose sum is σ = 42974027712. Its totient is φ = 10407317760.

The previous prime is 21321102083. The next prime is 21321102119. The reversal of 21321102112 is 21120112312.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21321102119) 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 7 ways as a sum of consecutive naturals, for example, 4925293 + ... + 4929619.

It is an arithmetic number, because the mean of its divisors is an integer number (895292244).

Almost surely, 2^21321102112 is an apocalyptic number.

It is an amenable number.

21321102112 is an abundant number, since it is smaller than the sum of its proper divisors (21652925600).

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

21321102112 is a wasteful number, since it uses less digits than its factorization.

21321102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7961 (or 7953 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21321102112 its reverse (21120112312), we get a palindrome (42441214424).

The spelling of 21321102112 in words is "twenty-one billion, three hundred twenty-one million, one hundred two thousand, one hundred twelve".