210010021993 has 2 divisors, whose sum is σ = 210010021994. Its totient is φ = 210010021992.

The previous prime is 210010021979. The next prime is 210010022003. The reversal of 210010021993 is 399120010012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182570762089 + 27439259904 = 427283^2 + 165648^2 .

It is a cyclic number.

It is not a de Polignac number, because 210010021993 - 2¹⁷ = 210009890921 is a prime.

It is not a weakly prime, because it can be changed into another prime (210010021093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105005010996 + 105005010997.

It is an arithmetic number, because the mean of its divisors is an integer number (105005010997).

Almost surely, 2^210010021993 is an apocalyptic number.

It is an amenable number.

210010021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210010021993 is an equidigital number, since it uses as much as digits as its factorization.

210010021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 210010021993 in words is "two hundred ten billion, ten million, twenty-one thousand, nine hundred ninety-three".