121223023213 has 4 divisors (see below), whose sum is σ = 122036600700. Its totient is φ = 120409445728.

The previous prime is 121223023189. The next prime is 121223023237. The reversal of 121223023213 is 312320322121.

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

It is an interprime number because it is at equal distance from previous prime (121223023189) and next prime (121223023237).

It can be written as a sum of positive squares in 2 ways, for example, as 53166214084 + 68056809129 = 230578^2 + 260877^2 .

It is a cyclic number.

It is not a de Polignac number, because 121223023213 - 2¹³ = 121223015021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121223024213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406788520 + ... + 406788817.

It is an arithmetic number, because the mean of its divisors is an integer number (30509150175).

Almost surely, 2^121223023213 is an apocalyptic number.

It is an amenable number.

121223023213 is a deficient number, since it is larger than the sum of its proper divisors (813577487).

121223023213 is an equidigital number, since it uses as much as digits as its factorization.

121223023213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813577486.

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

Adding to 121223023213 its reverse (312320322121), we get a palindrome (433543345334).

The spelling of 121223023213 in words is "one hundred twenty-one billion, two hundred twenty-three million, twenty-three thousand, two hundred thirteen".