21234324402112 has 28 divisors (see below), whose sum is σ = 43968899987856. Its totient is φ = 10155546452480.

The previous prime is 21234324402079. The next prime is 21234324402113. The reversal of 21234324402112 is 21120442343212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234324402113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7212744589 + ... + 7212747532.

Almost surely, 2^{21234324402112} is an apocalyptic number.

It is an amenable number.

21234324402112 is an abundant number, since it is smaller than the sum of its proper divisors (22734575585744).

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

21234324402112 is a wasteful number, since it uses less digits than its factorization.

21234324402112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425492156 (or 14425492146 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21234324402112 its reverse (21120442343212), we get a palindrome (42354766745324).

The spelling of 21234324402112 in words is "twenty-one trillion, two hundred thirty-four billion, three hundred twenty-four million, four hundred two thousand, one hundred twelve".