211240999997 has 2 divisors, whose sum is σ = 211240999998. Its totient is φ = 211240999996.

The previous prime is 211240999961. The next prime is 211241000021. The reversal of 211240999997 is 799999042112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186987921241 + 24253078756 = 432421^2 + 155734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211240999997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211240999097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105620499998 + 105620499999.

It is an arithmetic number, because the mean of its divisors is an integer number (105620499999).

Almost surely, 2^211240999997 is an apocalyptic number.

It is an amenable number.

211240999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

211240999997 is an equidigital number, since it uses as much as digits as its factorization.

211240999997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6613488, while the sum is 62.

The spelling of 211240999997 in words is "two hundred eleven billion, two hundred forty million, nine hundred ninety-nine thousand, nine hundred ninety-seven".