21402104032 has 96 divisors (see below), whose sum is σ = 47237450400. Its totient is φ = 9485549568.

The previous prime is 21402104029. The next prime is 21402104039. The reversal of 21402104032 is 23040120412.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402104039) 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 15 ways as a sum of consecutive naturals, for example, 1782144 + ... + 1794112.

It is an arithmetic number, because the mean of its divisors is an integer number (492056775).

Almost surely, 2^21402104032 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 21402104032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23618725200).

21402104032 is an abundant number, since it is smaller than the sum of its proper divisors (25835346368).

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

21402104032 is a wasteful number, since it uses less digits than its factorization.

21402104032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12188 (or 12180 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21402104032 its reverse (23040120412), we get a palindrome (44442224444).

The spelling of 21402104032 in words is "twenty-one billion, four hundred two million, one hundred four thousand, thirty-two".