212120131511 has 2 divisors, whose sum is σ = 212120131512. Its totient is φ = 212120131510.

The previous prime is 212120131507. The next prime is 212120131513. The reversal of 212120131511 is 115131021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212120131511 - 2² = 212120131507 is a prime.

Together with 212120131513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212120131513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060065755 + 106060065756.

It is an arithmetic number, because the mean of its divisors is an integer number (106060065756).

Almost surely, 2^212120131511 is an apocalyptic number.

212120131511 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120131511 is an equidigital number, since it uses as much as digits as its factorization.

212120131511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 212120131511 its reverse (115131021212), we get a palindrome (327251152723).

The spelling of 212120131511 in words is "two hundred twelve billion, one hundred twenty million, one hundred thirty-one thousand, five hundred eleven".