1221423221211 has 8 divisors (see below), whose sum is σ = 1628641683264. Its totient is φ = 814243453320.

The previous prime is 1221423221191. The next prime is 1221423221237. The reversal of 1221423221211 is 1121223241221.

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

It is not a de Polignac number, because 1221423221211 - 2¹⁰ = 1221423220187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221423221911) 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, 9599805 + ... + 9726206.

It is an arithmetic number, because the mean of its divisors is an integer number (203580210408).

Almost surely, 2^{1221423221211} is an apocalyptic number.

1221423221211 is a deficient number, since it is larger than the sum of its proper divisors (407218462053).

1221423221211 is a wasteful number, since it uses less digits than its factorization.

1221423221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19347081.

The product of its digits is 768, while the sum is 24.

Adding to 1221423221211 its reverse (1121223241221), we get a palindrome (2342646462432).

The spelling of 1221423221211 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-three million, two hundred twenty-one thousand, two hundred eleven".