213113212381 has 2 divisors, whose sum is σ = 213113212382. Its totient is φ = 213113212380.

The previous prime is 213113212357. The next prime is 213113212421. The reversal of 213113212381 is 183212311312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119823284025 + 93289928356 = 346155^2 + 305434^2 .

It is a cyclic number.

It is not a de Polignac number, because 213113212381 - 2²⁷ = 212978994653 is a prime.

It is a super-2 number, since 2×213113212381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213113212181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106556606190 + 106556606191.

It is an arithmetic number, because the mean of its divisors is an integer number (106556606191).

Almost surely, 2^213113212381 is an apocalyptic number.

It is an amenable number.

213113212381 is a deficient number, since it is larger than the sum of its proper divisors (1).

213113212381 is an equidigital number, since it uses as much as digits as its factorization.

213113212381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

Adding to 213113212381 its reverse (183212311312), we get a palindrome (396325523693).

The spelling of 213113212381 in words is "two hundred thirteen billion, one hundred thirteen million, two hundred twelve thousand, three hundred eighty-one".