211755420397 has 2 divisors, whose sum is σ = 211755420398. Its totient is φ = 211755420396.

The previous prime is 211755420389. The next prime is 211755420439. The reversal of 211755420397 is 793024557112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195811560036 + 15943860361 = 442506^2 + 126269^2 .

It is a cyclic number.

It is not a de Polignac number, because 211755420397 - 2³ = 211755420389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211755420497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105877710198 + 105877710199.

It is an arithmetic number, because the mean of its divisors is an integer number (105877710199).

Almost surely, 2^211755420397 is an apocalyptic number.

It is an amenable number.

211755420397 is a deficient number, since it is larger than the sum of its proper divisors (1).

211755420397 is an equidigital number, since it uses as much as digits as its factorization.

211755420397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 211755420397 in words is "two hundred eleven billion, seven hundred fifty-five million, four hundred twenty thousand, three hundred ninety-seven".