123121010213 has 8 divisors (see below), whose sum is σ = 124852555800. Its totient is φ = 121390679808.

The previous prime is 123121010209. The next prime is 123121010231. The reversal of 123121010213 is 312010121321.

It can be written as a sum of positive squares in 4 ways, for example, as 7614831169 + 115506179044 = 87263^2 + 339862^2 .

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 123121010213 - 2² = 123121010209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123121010191 and 123121010200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121010263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98768 + ... + 505961.

It is an arithmetic number, because the mean of its divisors is an integer number (15606569475).

Almost surely, 2^123121010213 is an apocalyptic number.

It is an amenable number.

123121010213 is a deficient number, since it is larger than the sum of its proper divisors (1731545587).

123121010213 is an equidigital number, since it uses as much as digits as its factorization.

123121010213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607591.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 123121010213 its reverse (312010121321), we get a palindrome (435131131534).

The spelling of 123121010213 in words is "one hundred twenty-three billion, one hundred twenty-one million, ten thousand, two hundred thirteen".