1212211213221 has 8 divisors (see below), whose sum is σ = 1653869562400. Its totient is φ = 789346836432.

The previous prime is 1212211213217. The next prime is 1212211213237. The reversal of 1212211213221 is 1223121122121.

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

It is not a de Polignac number, because 1212211213221 - 2² = 1212211213217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212213213221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4698492946 + ... + 4698493203.

It is an arithmetic number, because the mean of its divisors is an integer number (206733695300).

Almost surely, 2^{1212211213221} is an apocalyptic number.

It is an amenable number.

1212211213221 is a deficient number, since it is larger than the sum of its proper divisors (441658349179).

1212211213221 is an equidigital number, since it uses as much as digits as its factorization.

1212211213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9396986195.

The product of its digits is 192, while the sum is 21.

Adding to 1212211213221 its reverse (1223121122121), we get a palindrome (2435332335342).

The spelling of 1212211213221 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred thirteen thousand, two hundred twenty-one".