21040120324203 has 8 divisors (see below), whose sum is σ = 28061483951616. Its totient is φ = 14022751789800.

The previous prime is 21040120324193. The next prime is 21040120324229. The reversal of 21040120324203 is 30242302104012.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21040120324203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21040120324243) 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, 998760963 + ... + 998782028.

It is an arithmetic number, because the mean of its divisors is an integer number (3507685493952).

Almost surely, 2^{21040120324203} is an apocalyptic number.

21040120324203 is a deficient number, since it is larger than the sum of its proper divisors (7021363627413).

21040120324203 is a wasteful number, since it uses less digits than its factorization.

21040120324203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997546505.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21040120324203 its reverse (30242302104012), we get a palindrome (51282422428215).

The spelling of 21040120324203 in words is "twenty-one trillion, forty billion, one hundred twenty million, three hundred twenty-four thousand, two hundred three".