21331153424201 has 4 divisors (see below), whose sum is σ = 21680844464004. Its totient is φ = 20981462384400.

The previous prime is 21331153424167. The next prime is 21331153424257. The reversal of 21331153424201 is 10242435113312.

It is a happy number.

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 828007182601 + 20503146241600 = 909949^2 + 4528040^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331153424201 - 2¹⁸ = 21331153162057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331153420201) 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, 174845519810 + ... + 174845519931.

It is an arithmetic number, because the mean of its divisors is an integer number (5420211116001).

Almost surely, 2^{21331153424201} is an apocalyptic number.

It is an amenable number.

21331153424201 is a deficient number, since it is larger than the sum of its proper divisors (349691039803).

21331153424201 is an equidigital number, since it uses as much as digits as its factorization.

21331153424201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349691039802.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 21331153424201 its reverse (10242435113312), we get a palindrome (31573588537513).

The spelling of 21331153424201 in words is "twenty-one trillion, three hundred thirty-one billion, one hundred fifty-three million, four hundred twenty-four thousand, two hundred one".