1221310201309 has 4 divisors (see below), whose sum is σ = 1332338401440. Its totient is φ = 1110282001180.

The previous prime is 1221310201271. The next prime is 1221310201357. The reversal of 1221310201309 is 9031020131221.

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 not a de Polignac number, because 1221310201309 - 2⁹ = 1221310200797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221310202309) 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, 55514100049 + ... + 55514100070.

It is an arithmetic number, because the mean of its divisors is an integer number (333084600360).

Almost surely, 2^{1221310201309} is an apocalyptic number.

It is an amenable number.

1221310201309 is a deficient number, since it is larger than the sum of its proper divisors (111028200131).

1221310201309 is a wasteful number, since it uses less digits than its factorization.

1221310201309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111028200130.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 1221310201309 in words is "one trillion, two hundred twenty-one billion, three hundred ten million, two hundred one thousand, three hundred nine".