21030020210 has 8 divisors (see below), whose sum is σ = 37854036396. Its totient is φ = 8412008080.

The previous prime is 21030020203. The next prime is 21030020213. The reversal of 21030020210 is 1202003012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19416471649 + 1613548561 = 139343^2 + 40169^2 .

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 = 21030020191 and 21030020200.

It is not an unprimeable number, because it can be changed into a prime (21030020213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051501001 + ... + 1051501020.

Almost surely, 2^21030020210 is an apocalyptic number.

21030020210 is a deficient number, since it is larger than the sum of its proper divisors (16824016186).

21030020210 is a wasteful number, since it uses less digits than its factorization.

21030020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103002028.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21030020210 its reverse (1202003012), we get a palindrome (22232023222).

The spelling of 21030020210 in words is "twenty-one billion, thirty million, twenty thousand, two hundred ten".