211012021993 has 2 divisors, whose sum is σ = 211012021994. Its totient is φ = 211012021992.

The previous prime is 211012021981. The next prime is 211012022021. The reversal of 211012021993 is 399120210112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146258058969 + 64753963024 = 382437^2 + 254468^2 .

It is a cyclic number.

It is not a de Polignac number, because 211012021993 - 2²⁵ = 210978467561 is a prime.

It is not a weakly prime, because it can be changed into another prime (211012021963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105506010996 + 105506010997.

It is an arithmetic number, because the mean of its divisors is an integer number (105506010997).

Almost surely, 2^211012021993 is an apocalyptic number.

It is an amenable number.

211012021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

211012021993 is an equidigital number, since it uses as much as digits as its factorization.

211012021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 211012021993 in words is "two hundred eleven billion, twelve million, twenty-one thousand, nine hundred ninety-three".