1221121212023 has 4 divisors (see below), whose sum is σ = 1221236346720. Its totient is φ = 1221006077328.

The previous prime is 1221121211983. The next prime is 1221121212067. The reversal of 1221121212023 is 3202121211221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221121212023 - 2⁸ = 1221121211767 is a prime.

It is a super-2 number, since 2×1221121212023² (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 = 1221121211986 and 1221121212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221121212083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57551438 + ... + 57572651.

It is an arithmetic number, because the mean of its divisors is an integer number (305309086680).

Almost surely, 2^{1221121212023} is an apocalyptic number.

1221121212023 is a deficient number, since it is larger than the sum of its proper divisors (115134697).

1221121212023 is a wasteful number, since it uses less digits than its factorization.

1221121212023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115134696.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221121212023 its reverse (3202121211221), we get a palindrome (4423242423244).

The spelling of 1221121212023 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, twenty-three".