121212303223 has 4 divisors (see below), whose sum is σ = 132231603528. Its totient is φ = 110193002920.

The previous prime is 121212303193. The next prime is 121212303227. The reversal of 121212303223 is 322303212121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322303212121 = 11 ⋅29300292011.

It is not a de Polignac number, because 121212303223 - 2¹³ = 121212295031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212303194 and 121212303203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212303227) 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, 5509650136 + ... + 5509650157.

It is an arithmetic number, because the mean of its divisors is an integer number (33057900882).

Almost surely, 2^121212303223 is an apocalyptic number.

121212303223 is a deficient number, since it is larger than the sum of its proper divisors (11019300305).

121212303223 is a wasteful number, since it uses less digits than its factorization.

121212303223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11019300304.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 121212303223 its reverse (322303212121), we get a palindrome (443515515344).

The spelling of 121212303223 in words is "one hundred twenty-one billion, two hundred twelve million, three hundred three thousand, two hundred twenty-three".