21020200210 has 32 divisors (see below), whose sum is σ = 40095745200. Its totient is φ = 7920138240.

The previous prime is 21020200207. The next prime is 21020200219. The reversal of 21020200210 is 1200202012.

It can be written as a sum of positive squares in 8 ways, for example, as 1302704649 + 19717495561 = 36093^2 + 140419^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21020200219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 872055 + ... + 895834.

Almost surely, 2^21020200210 is an apocalyptic number.

21020200210 is a deficient number, since it is larger than the sum of its proper divisors (19075544990).

21020200210 is a wasteful number, since it uses less digits than its factorization.

21020200210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767966.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21020200210 its reverse (1200202012), we get a palindrome (22220402222).

It can be divided in two parts, 210202002 and 10, that added together give a palindrome (210202012).

The spelling of 21020200210 in words is "twenty-one billion, twenty million, two hundred thousand, two hundred ten".