13021321641 has 4 divisors (see below), whose sum is σ = 17361762192. Its totient is φ = 8680881092.

The previous prime is 13021321631. The next prime is 13021321657. The reversal of 13021321641 is 14612312031.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14612312031 = 3 ⋅4870770677.

It is a cyclic number.

It is not a de Polignac number, because 13021321641 - 2⁵ = 13021321609 is a prime.

It is a super-3 number, since 3×13021321641³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (13021321631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2170220271 + ... + 2170220276.

It is an arithmetic number, because the mean of its divisors is an integer number (4340440548).

Almost surely, 2^13021321641 is an apocalyptic number.

It is an amenable number.

13021321641 is a deficient number, since it is larger than the sum of its proper divisors (4340440551).

13021321641 is an equidigital number, since it uses as much as digits as its factorization.

13021321641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4340440550.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 13021321641 its reverse (14612312031), we get a palindrome (27633633672).

The spelling of 13021321641 in words is "thirteen billion, twenty-one million, three hundred twenty-one thousand, six hundred forty-one".