21103214112 has 144 divisors (see below), whose sum is σ = 63877911552. Its totient is φ = 6585661440.

The previous prime is 21103214089. The next prime is 21103214123. The reversal of 21103214112 is 21141230112.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 923853 + ... + 946419.

It is an arithmetic number, because the mean of its divisors is an integer number (443596608).

Almost surely, 2^21103214112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103214112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31938955776).

21103214112 is an abundant number, since it is smaller than the sum of its proper divisors (42774697440).

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

21103214112 is a wasteful number, since it uses less digits than its factorization.

21103214112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22791 (or 22780 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21103214112 its reverse (21141230112), we get a palindrome (42244444224).

The spelling of 21103214112 in words is "twenty-one billion, one hundred three million, two hundred fourteen thousand, one hundred twelve".