1213111221207 has 4 divisors (see below), whose sum is σ = 1617481628280. Its totient is φ = 808740814136.

The previous prime is 1213111221199. The next prime is 1213111221211. The reversal of 1213111221207 is 7021221113121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213111221207 - 2³ = 1213111221199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213111226207) 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, 202185203532 + ... + 202185203537.

It is an arithmetic number, because the mean of its divisors is an integer number (404370407070).

Almost surely, 2^{1213111221207} is an apocalyptic number.

1213111221207 is a deficient number, since it is larger than the sum of its proper divisors (404370407073).

1213111221207 is an equidigital number, since it uses as much as digits as its factorization.

1213111221207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404370407072.

The product of its (nonzero) digits is 336, while the sum is 24.

Adding to 1213111221207 its reverse (7021221113121), we get a palindrome (8234332334328).

The spelling of 1213111221207 in words is "one trillion, two hundred thirteen billion, one hundred eleven million, two hundred twenty-one thousand, two hundred seven".