13221001001 has 4 divisors (see below), whose sum is σ = 14238001092. Its totient is φ = 12204000912.

The previous prime is 13221000959. The next prime is 13221001007. The reversal of 13221001001 is 10010012231.

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 1734306025 + 11486694976 = 41645^2 + 107176^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221001001 - 2⁶ = 13221000937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221001007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508500026 + ... + 508500051.

It is an arithmetic number, because the mean of its divisors is an integer number (3559500273).

Almost surely, 2^13221001001 is an apocalyptic number.

It is an amenable number.

13221001001 is a deficient number, since it is larger than the sum of its proper divisors (1017000091).

13221001001 is a wasteful number, since it uses less digits than its factorization.

13221001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017000090.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 13221001001 its reverse (10010012231), we get a palindrome (23231013232).

The spelling of 13221001001 in words is "thirteen billion, two hundred twenty-one million, one thousand, one".