211987455413 has 2 divisors, whose sum is σ = 211987455414. Its totient is φ = 211987455412.

The previous prime is 211987455409. The next prime is 211987455451. The reversal of 211987455413 is 314554789112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149658338449 + 62329116964 = 386857^2 + 249658^2 .

It is a cyclic number.

It is not a de Polignac number, because 211987455413 - 2² = 211987455409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211987455473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105993727706 + 105993727707.

It is an arithmetic number, because the mean of its divisors is an integer number (105993727707).

Almost surely, 2^211987455413 is an apocalyptic number.

It is an amenable number.

211987455413 is a deficient number, since it is larger than the sum of its proper divisors (1).

211987455413 is an equidigital number, since it uses as much as digits as its factorization.

211987455413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 50.

The spelling of 211987455413 in words is "two hundred eleven billion, nine hundred eighty-seven million, four hundred fifty-five thousand, four hundred thirteen".