1213101203213 has 4 divisors (see below), whose sum is σ = 1214407018140. Its totient is φ = 1211795388288.

The previous prime is 1213101203203. The next prime is 1213101203239. The reversal of 1213101203213 is 3123021013121.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73634621449 + 1139466581764 = 271357^2 + 1067458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213101203213 - 2³⁰ = 1212027461389 is a prime.

It is a super-2 number, since 2×1213101203213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213101203203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652906070 + ... + 652907927.

It is an arithmetic number, because the mean of its divisors is an integer number (303601754535).

Almost surely, 2^{1213101203213} is an apocalyptic number.

It is an amenable number.

1213101203213 is a deficient number, since it is larger than the sum of its proper divisors (1305814927).

1213101203213 is an equidigital number, since it uses as much as digits as its factorization.

1213101203213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305814926.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1213101203213 its reverse (3123021013121), we get a palindrome (4336122216334).

The spelling of 1213101203213 in words is "one trillion, two hundred thirteen billion, one hundred one million, two hundred three thousand, two hundred thirteen".