210020431985 has 48 divisors (see below), whose sum is σ = 315821095632. Its totient is φ = 132894720000.

The previous prime is 210020431931. The next prime is 210020431991. The reversal of 210020431985 is 589134020012.

It can be written as a sum of positive squares in 8 ways, for example, as 68572230769 + 141448201216 = 261863^2 + 376096^2 .

It is not a de Polignac number, because 210020431985 - 2²² = 210016237681 is a prime.

It is a super-2 number, since 2×210020431985² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12734945 + ... + 12751425.

It is an arithmetic number, because the mean of its divisors is an integer number (6579606159).

Almost surely, 2^210020431985 is an apocalyptic number.

It is an amenable number.

210020431985 is a deficient number, since it is larger than the sum of its proper divisors (105800663647).

210020431985 is a wasteful number, since it uses less digits than its factorization.

210020431985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20514 (or 20507 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 210020431985 its reverse (589134020012), we get a palindrome (799154451997).

The spelling of 210020431985 in words is "two hundred ten billion, twenty million, four hundred thirty-one thousand, nine hundred eighty-five".