21403402112 has 64 divisors (see below), whose sum is σ = 44956867200. Its totient is φ = 10121946624.

The previous prime is 21403402087. The next prime is 21403402133. The reversal of 21403402112 is 21120430412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1556933 + ... + 1570619.

It is an arithmetic number, because the mean of its divisors is an integer number (702451050).

Almost surely, 2^21403402112 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 21403402112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22478433600).

21403402112 is an abundant number, since it is smaller than the sum of its proper divisors (23553465088).

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

21403402112 is a wasteful number, since it uses less digits than its factorization.

21403402112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14363 (or 14351 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21403402112 its reverse (21120430412), we get a palindrome (42523832524).

The spelling of 21403402112 in words is "twenty-one billion, four hundred three million, four hundred two thousand, one hundred twelve".