21403432001 has 8 divisors (see below), whose sum is σ = 24770699520. Its totient is φ = 18113573088.

The previous prime is 21403431979. The next prime is 21403432031. The reversal of 21403432001 is 10023430412.

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

It is a cyclic number.

It is not a de Polignac number, because 21403432001 - 2⁶ = 21403431937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21403432031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19351556 + ... + 19352661.

It is an arithmetic number, because the mean of its divisors is an integer number (3096337440).

Almost surely, 2^21403432001 is an apocalyptic number.

It is an amenable number.

21403432001 is a deficient number, since it is larger than the sum of its proper divisors (3367267519).

21403432001 is an equidigital number, since it uses as much as digits as its factorization.

21403432001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38704303.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21403432001 its reverse (10023430412), we get a palindrome (31426862413).

The spelling of 21403432001 in words is "twenty-one billion, four hundred three million, four hundred thirty-two thousand, one".