1213231122221 has 8 divisors (see below), whose sum is σ = 1296857870784. Its totient is φ = 1132177504480.

The previous prime is 1213231122193. The next prime is 1213231122227. The reversal of 1213231122221 is 1222211323121.

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 1213231122221 - 2³⁸ = 938353215277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213231122227) 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, 643281731 + ... + 643283616.

It is an arithmetic number, because the mean of its divisors is an integer number (162107233848).

Almost surely, 2^{1213231122221} is an apocalyptic number.

It is an amenable number.

1213231122221 is a deficient number, since it is larger than the sum of its proper divisors (83626748563).

1213231122221 is a wasteful number, since it uses less digits than its factorization.

1213231122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286565411.

The product of its digits is 576, while the sum is 23.

Adding to 1213231122221 its reverse (1222211323121), we get a palindrome (2435442445342).

The spelling of 1213231122221 in words is "one trillion, two hundred thirteen billion, two hundred thirty-one million, one hundred twenty-two thousand, two hundred twenty-one".