210202201985 has 4 divisors (see below), whose sum is σ = 252242642388. Its totient is φ = 168161761584.

The previous prime is 210202201973. The next prime is 210202202017. The reversal of 210202201985 is 589102202012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91910229889 + 118291972096 = 303167^2 + 343936^2 .

It is a cyclic number.

It is not a de Polignac number, because 210202201985 - 2¹⁸ = 210201939841 is a prime.

It is a super-3 number, since 3×210202201985³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21020220194 + ... + 21020220203.

It is an arithmetic number, because the mean of its divisors is an integer number (63060660597).

Almost surely, 2^210202201985 is an apocalyptic number.

It is an amenable number.

210202201985 is a deficient number, since it is larger than the sum of its proper divisors (42040440403).

210202201985 is an equidigital number, since it uses as much as digits as its factorization.

210202201985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42040440402.

The product of its (nonzero) digits is 5760, while the sum is 32.

Adding to 210202201985 its reverse (589102202012), we get a palindrome (799304403997).

The spelling of 210202201985 in words is "two hundred ten billion, two hundred two million, two hundred one thousand, nine hundred eighty-five".