21532132406 has 8 divisors (see below), whose sum is σ = 32687333784. Its totient is φ = 10636354480.

The previous prime is 21532132403. The next prime is 21532132411. The reversal of 21532132406 is 60423123512.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532132403) 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, 64855655 + ... + 64855986.

It is an arithmetic number, because the mean of its divisors is an integer number (4085916723).

Almost surely, 2^21532132406 is an apocalyptic number.

21532132406 is a deficient number, since it is larger than the sum of its proper divisors (11155201378).

21532132406 is a wasteful number, since it uses less digits than its factorization.

21532132406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129711726.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21532132406 its reverse (60423123512), we get a palindrome (81955255918).

The spelling of 21532132406 in words is "twenty-one billion, five hundred thirty-two million, one hundred thirty-two thousand, four hundred six".