210202021993 has 2 divisors, whose sum is σ = 210202021994. Its totient is φ = 210202021992.

The previous prime is 210202021987. The next prime is 210202022087. The reversal of 210202021993 is 399120202012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161324329104 + 48877692889 = 401652^2 + 221083^2 .

It is a cyclic number.

It is not a de Polignac number, because 210202021993 - 2⁵ = 210202021961 is a prime.

It is not a weakly prime, because it can be changed into another prime (210202021193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105101010996 + 105101010997.

It is an arithmetic number, because the mean of its divisors is an integer number (105101010997).

Almost surely, 2^210202021993 is an apocalyptic number.

It is an amenable number.

210202021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210202021993 is an equidigital number, since it uses as much as digits as its factorization.

210202021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 210202021993 in words is "two hundred ten billion, two hundred two million, twenty-one thousand, nine hundred ninety-three".