1201312321221 has 8 divisors (see below), whose sum is σ = 1601803769760. Its totient is φ = 800847876752.

The previous prime is 1201312321207. The next prime is 1201312321277. The reversal of 1201312321221 is 1221232131021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201312321221 - 2⁹ = 1201312320709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201312321021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6646986 + ... + 6825323.

It is an arithmetic number, because the mean of its divisors is an integer number (200225471220).

Almost surely, 2^{1201312321221} is an apocalyptic number.

It is an amenable number.

1201312321221 is a deficient number, since it is larger than the sum of its proper divisors (400491448539).

1201312321221 is a wasteful number, since it uses less digits than its factorization.

1201312321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13502035.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1201312321221 its reverse (1221232131021), we get a palindrome (2422544452242).

The spelling of 1201312321221 in words is "one trillion, two hundred one billion, three hundred twelve million, three hundred twenty-one thousand, two hundred twenty-one".