1221121121323 has 8 divisors (see below), whose sum is σ = 1222562880000. Its totient is φ = 1219680147048.

The previous prime is 1221121121261. The next prime is 1221121121327. The reversal of 1221121121323 is 3231211211221.

It is a happy number.

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 1221121121323 - 2²¹ = 1221119024171 is a prime.

It is a super-2 number, since 2×1221121121323² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221121121294 and 1221121121303.

It is not an unprimeable number, because it can be changed into a prime (1221121121327) 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, 2948928 + ... + 3337426.

It is an arithmetic number, because the mean of its divisors is an integer number (152820360000).

Almost surely, 2^{1221121121323} is an apocalyptic number.

1221121121323 is a deficient number, since it is larger than the sum of its proper divisors (1441758677).

1221121121323 is a wasteful number, since it uses less digits than its factorization.

1221121121323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392201.

The product of its digits is 288, while the sum is 22.

Adding to 1221121121323 its reverse (3231211211221), we get a palindrome (4452332332544).

The spelling of 1221121121323 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, three hundred twenty-three".