1320012221 has 4 divisors (see below), whose sum is σ = 1440013344. Its totient is φ = 1200011100.

The previous prime is 1320012217. The next prime is 1320012257. The reversal of 1320012221 is 1222100231.

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.

It is a cyclic number.

It is not a de Polignac number, because 1320012221 - 2² = 1320012217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320012196 and 1320012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320012121) 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, 60000545 + ... + 60000566.

It is an arithmetic number, because the mean of its divisors is an integer number (360003336).

Almost surely, 2^1320012221 is an apocalyptic number.

1320012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1320012221 is a deficient number, since it is larger than the sum of its proper divisors (120001123).

1320012221 is a wasteful number, since it uses less digits than its factorization.

1320012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120001122.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1320012221 is about 36331.9724347578. The cubic root of 1320012221 is about 1096.9646958206.

Adding to 1320012221 its reverse (1222100231), we get a palindrome (2542112452).

The spelling of 1320012221 in words is "one billion, three hundred twenty million, twelve thousand, two hundred twenty-one".