1300001221 has 4 divisors (see below), whose sum is σ = 1322035200. Its totient is φ = 1277967244.

The previous prime is 1300001177. The next prime is 1300001231. The reversal of 1300001221 is 1221000031.

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.

It is a cyclic number.

It is not a de Polignac number, because 1300001221 - 2²⁵ = 1266446789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1300001198 and 1300001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300001231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11016901 + ... + 11017018.

It is an arithmetic number, because the mean of its divisors is an integer number (330508800).

Almost surely, 2^1300001221 is an apocalyptic number.

It is an amenable number.

1300001221 is a deficient number, since it is larger than the sum of its proper divisors (22033979).

1300001221 is an equidigital number, since it uses as much as digits as its factorization.

1300001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22033978.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1300001221 is about 36055.5296868594. The cubic root of 1300001221 is about 1091.3932247509.

Adding to 1300001221 its reverse (1221000031), we get a palindrome (2521001252).

The spelling of 1300001221 in words is "one billion, three hundred million, one thousand, two hundred twenty-one".