21201321201331 has 4 divisors (see below), whose sum is σ = 21601346129712. Its totient is φ = 20801296272952.

The previous prime is 21201321201289. The next prime is 21201321201367. The reversal of 21201321201331 is 13310212310212.

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

It is a cyclic number.

It is not a de Polignac number, because 21201321201331 - 2¹³ = 21201321193139 is a prime.

It is a super-2 number, since 2×21201321201331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201321201631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200012464111 + ... + 200012464216.

It is an arithmetic number, because the mean of its divisors is an integer number (5400336532428).

Almost surely, 2^{21201321201331} is an apocalyptic number.

21201321201331 is a deficient number, since it is larger than the sum of its proper divisors (400024928381).

21201321201331 is an equidigital number, since it uses as much as digits as its factorization.

21201321201331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400024928380.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21201321201331 its reverse (13310212310212), we get a palindrome (34511533511543).

The spelling of 21201321201331 in words is "twenty-one trillion, two hundred one billion, three hundred twenty-one million, two hundred one thousand, three hundred thirty-one".