21210202020210 has 32 divisors (see below), whose sum is σ = 58176554113152. Its totient is φ = 4848046176000.

The previous prime is 21210202020197. The next prime is 21210202020251. The reversal of 21210202020210 is 1202020201212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21210202020210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50500480791 + ... + 50500481210.

It is an arithmetic number, because the mean of its divisors is an integer number (1818017316036).

Almost surely, 2^{21210202020210} is an apocalyptic number.

21210202020210 is an abundant number, since it is smaller than the sum of its proper divisors (36966352092942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210202020210 is a wasteful number, since it uses less digits than its factorization.

21210202020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101000962018.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21210202020210 its reverse (1202020201212), we get a palindrome (22412222221422).

The spelling of 21210202020210 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, twenty thousand, two hundred ten".