21432004402 has 8 divisors (see below), whose sum is σ = 32149626012. Its totient is φ = 10715462400.

The previous prime is 21432004379. The next prime is 21432004409. The reversal of 21432004402 is 20440023412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19861546761 + 1570457641 = 140931^2 + 39629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21432004409) 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, 218299 + ... + 300862.

Almost surely, 2^21432004402 is an apocalyptic number.

21432004402 is a deficient number, since it is larger than the sum of its proper divisors (10717621610).

21432004402 is a wasteful number, since it uses less digits than its factorization.

21432004402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539804.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21432004402 its reverse (20440023412), we get a palindrome (41872027814).

The spelling of 21432004402 in words is "twenty-one billion, four hundred thirty-two million, four thousand, four hundred two".