21132432001 has 4 divisors (see below), whose sum is σ = 21623883952. Its totient is φ = 20640980052.

The previous prime is 21132431953. The next prime is 21132432019. The reversal of 21132432001 is 10023423112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21132432001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21132432001.

It is not an unprimeable number, because it can be changed into a prime (21132432091) 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 3 ways as a sum of consecutive naturals, for example, 245725911 + ... + 245725996.

It is an arithmetic number, because the mean of its divisors is an integer number (5405970988).

Almost surely, 2^21132432001 is an apocalyptic number.

It is an amenable number.

21132432001 is a deficient number, since it is larger than the sum of its proper divisors (491451951).

21132432001 is an equidigital number, since it uses as much as digits as its factorization.

21132432001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491451950.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21132432001 its reverse (10023423112), we get a palindrome (31155855113).

The spelling of 21132432001 in words is "twenty-one billion, one hundred thirty-two million, four hundred thirty-two thousand, one".