1312201221221 has 4 divisors (see below), whose sum is σ = 1431492241344. Its totient is φ = 1192910201100.

The previous prime is 1312201221197. The next prime is 1312201221229. The reversal of 1312201221221 is 1221221022131.

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 1312201221221 - 2⁶ = 1312201221157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312201221193 and 1312201221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312201221229) 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, 59645510045 + ... + 59645510066.

It is an arithmetic number, because the mean of its divisors is an integer number (357873060336).

Almost surely, 2^{1312201221221} is an apocalyptic number.

1312201221221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1312201221221 is a deficient number, since it is larger than the sum of its proper divisors (119291020123).

1312201221221 is a wasteful number, since it uses less digits than its factorization.

1312201221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119291020122.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1312201221221 its reverse (1221221022131), we get a palindrome (2533422243352).

The spelling of 1312201221221 in words is "one trillion, three hundred twelve billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".