1212121203213 has 8 divisors (see below), whose sum is σ = 1653746758048. Its totient is φ = 789288225264.

The previous prime is 1212121203197. The next prime is 1212121203289. The reversal of 1212121203213 is 3123021212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212121203213 - 2⁴ = 1212121203197 is a prime.

It is a super-2 number, since 2×1212121203213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212121203213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121203113) 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, 4698144070 + ... + 4698144327.

It is an arithmetic number, because the mean of its divisors is an integer number (206718344756).

Almost surely, 2^{1212121203213} is an apocalyptic number.

It is an amenable number.

1212121203213 is a deficient number, since it is larger than the sum of its proper divisors (441625554835).

1212121203213 is an equidigital number, since it uses as much as digits as its factorization.

1212121203213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9396288443.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1212121203213 its reverse (3123021212121), we get a palindrome (4335142415334).

The spelling of 1212121203213 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred three thousand, two hundred thirteen".