211200001997 has 2 divisors, whose sum is σ = 211200001998. Its totient is φ = 211200001996.

The previous prime is 211200001951. The next prime is 211200002081. The reversal of 211200001997 is 799100002112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206743905481 + 4456096516 = 454691^2 + 66754^2 .

It is a cyclic number.

It is not a de Polignac number, because 211200001997 - 2⁶ = 211200001933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211200001097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105600000998 + 105600000999.

It is an arithmetic number, because the mean of its divisors is an integer number (105600000999).

Almost surely, 2^211200001997 is an apocalyptic number.

It is an amenable number.

211200001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

211200001997 is an equidigital number, since it uses as much as digits as its factorization.

211200001997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The spelling of 211200001997 in words is "two hundred eleven billion, two hundred million, one thousand, nine hundred ninety-seven".