21240324401201 has 4 divisors (see below), whose sum is σ = 21428291873892. Its totient is φ = 21052356928512.

The previous prime is 21240324401117. The next prime is 21240324401209. The reversal of 21240324401201 is 10210442304212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 166725222400 + 21073599178801 = 408320^2 + 4590599^2 .

It is a cyclic number.

It is not a de Polignac number, because 21240324401201 - 2¹⁰ = 21240324400177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21240324401209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93983736176 + ... + 93983736401.

It is an arithmetic number, because the mean of its divisors is an integer number (5357072968473).

Almost surely, 2^{21240324401201} is an apocalyptic number.

It is an amenable number.

21240324401201 is a deficient number, since it is larger than the sum of its proper divisors (187967472691).

21240324401201 is a wasteful number, since it uses less digits than its factorization.

21240324401201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187967472690.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21240324401201 its reverse (10210442304212), we get a palindrome (31450766705413).

The spelling of 21240324401201 in words is "twenty-one trillion, two hundred forty billion, three hundred twenty-four million, four hundred one thousand, two hundred one".