210001210121993 has 2 divisors, whose sum is σ = 210001210121994. Its totient is φ = 210001210121992.

The previous prime is 210001210121959. The next prime is 210001210122017. The reversal of 210001210121993 is 399121012100012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206017565369344 + 3983644752649 = 14353312^2 + 1995907^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001210121993 - 2⁴⁰ = 208901698494217 is a prime.

It is not a weakly prime, because it can be changed into another prime (210001210121903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000605060996 + 105000605060997.

It is an arithmetic number, because the mean of its divisors is an integer number (105000605060997).

Almost surely, 2^{210001210121993} is an apocalyptic number.

It is an amenable number.

210001210121993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001210121993 is an equidigital number, since it uses as much as digits as its factorization.

210001210121993 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 32.

The spelling of 210001210121993 in words is "two hundred ten trillion, one billion, two hundred ten million, one hundred twenty-one thousand, nine hundred ninety-three".