213123201131 has 2 divisors, whose sum is σ = 213123201132. Its totient is φ = 213123201130.

The previous prime is 213123201121. The next prime is 213123201133. The reversal of 213123201131 is 131102321312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213123201131 is a prime.

It is a super-2 number, since 2×213123201131² (a number of 23 digits) contains 22 as substring.

Together with 213123201133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213123201133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106561600565 + 106561600566.

It is an arithmetic number, because the mean of its divisors is an integer number (106561600566).

Almost surely, 2^213123201131 is an apocalyptic number.

213123201131 is a deficient number, since it is larger than the sum of its proper divisors (1).

213123201131 is an equidigital number, since it uses as much as digits as its factorization.

213123201131 is an odious number, because the sum of its binary digits is odd.

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

Adding to 213123201131 its reverse (131102321312), we get a palindrome (344225522443).

The spelling of 213123201131 in words is "two hundred thirteen billion, one hundred twenty-three million, two hundred one thousand, one hundred thirty-one".