1221121202323 has 8 divisors (see below), whose sum is σ = 1343141579376. Its totient is φ = 1110110182720.

The previous prime is 1221121202299. The next prime is 1221121202333. The reversal of 1221121202323 is 3232021211221.

It is not a de Polignac number, because 1221121202323 - 2¹³ = 1221121194131 is a prime.

It is a super-2 number, since 2×1221121202323² (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 = 1221121202294 and 1221121202303.

It is not an unprimeable number, because it can be changed into a prime (1221121202333) 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, 458721886 + ... + 458724547.

It is an arithmetic number, because the mean of its divisors is an integer number (167892697422).

Almost surely, 2^{1221121202323} is an apocalyptic number.

1221121202323 is a deficient number, since it is larger than the sum of its proper divisors (122020377053).

1221121202323 is an frugal number, since it uses more digits than its factorization.

1221121202323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917446466 (or 917446444 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1221121202323 its reverse (3232021211221), we get a palindrome (4453142413544).

The spelling of 1221121202323 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred two thousand, three hundred twenty-three".