213121131044213 has 12 divisors (see below), whose sum is σ = 247922741637612. Its totient is φ = 182670595470720.

The previous prime is 213121131044197. The next prime is 213121131044249. The reversal of 213121131044213 is 312440131121312.

It can be written as a sum of positive squares in 2 ways, for example, as 67624027964689 + 145497103079524 = 8223383^2 + 12062218^2 .

It is not a de Polignac number, because 213121131044213 - 2⁴ = 213121131044197 is a prime.

It is a super-2 number, since 2×213121131044213² (a number of 29 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 (213121131044513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53531498 + ... + 57374763.

It is an arithmetic number, because the mean of its divisors is an integer number (20660228469801).

Almost surely, 2^{213121131044213} is an apocalyptic number.

It is an amenable number.

213121131044213 is a deficient number, since it is larger than the sum of its proper divisors (34801610593399).

213121131044213 is a wasteful number, since it uses less digits than its factorization.

213121131044213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110945492 (or 110945485 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 213121131044213 its reverse (312440131121312), we get a palindrome (525561262165525).

The spelling of 213121131044213 in words is "two hundred thirteen trillion, one hundred twenty-one billion, one hundred thirty-one million, forty-four thousand, two hundred thirteen".