213121012113 has 8 divisors (see below), whose sum is σ = 315734832800. Its totient is φ = 142080674724.

The previous prime is 213121012109. The next prime is 213121012127. The reversal of 213121012113 is 311210121312.

It is not a de Polignac number, because 213121012113 - 2² = 213121012109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213121012183) 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, 3946685383 + ... + 3946685436.

It is an arithmetic number, because the mean of its divisors is an integer number (39466854100).

Almost surely, 2^213121012113 is an apocalyptic number.

It is an amenable number.

213121012113 is a deficient number, since it is larger than the sum of its proper divisors (102613820687).

213121012113 is an equidigital number, since it uses as much as digits as its factorization.

213121012113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893370828 (or 7893370822 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 213121012113 its reverse (311210121312), we get a palindrome (524331133425).

The spelling of 213121012113 in words is "two hundred thirteen billion, one hundred twenty-one million, twelve thousand, one hundred thirteen".