212920254917 has 2 divisors, whose sum is σ = 212920254918. Its totient is φ = 212920254916.

The previous prime is 212920254913. The next prime is 212920254919. The reversal of 212920254917 is 719452029212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108108782401 + 104811472516 = 328799^2 + 323746^2 .

It is a cyclic number.

It is not a de Polignac number, because 212920254917 - 2² = 212920254913 is a prime.

Together with 212920254919, 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 (212920254913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106460127458 + 106460127459.

It is an arithmetic number, because the mean of its divisors is an integer number (106460127459).

Almost surely, 2^212920254917 is an apocalyptic number.

It is an amenable number.

212920254917 is a deficient number, since it is larger than the sum of its proper divisors (1).

212920254917 is an equidigital number, since it uses as much as digits as its factorization.

212920254917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 212920254917 in words is "two hundred twelve billion, nine hundred twenty million, two hundred fifty-four thousand, nine hundred seventeen".