20021210210 has 8 divisors (see below), whose sum is σ = 36038178396. Its totient is φ = 8008484080.

The previous prime is 20021210207. The next prime is 20021210219. The reversal of 20021210210 is 1201212002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16042502281 + 3978707929 = 126659^2 + 63077^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20021210191 and 20021210200.

It is not an unprimeable number, because it can be changed into a prime (20021210219) 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 3 ways as a sum of consecutive naturals, for example, 1001060501 + ... + 1001060520.

Almost surely, 2^20021210210 is an apocalyptic number.

20021210210 is a deficient number, since it is larger than the sum of its proper divisors (16016968186).

20021210210 is a wasteful number, since it uses less digits than its factorization.

20021210210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002121028.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021210210 its reverse (1201212002), we get a palindrome (21222422212).

The spelling of 20021210210 in words is "twenty billion, twenty-one million, two hundred ten thousand, two hundred ten".