21221020200210 has 16 divisors (see below), whose sum is σ = 50930448480576. Its totient is φ = 5658938720048.

The previous prime is 21221020200173. The next prime is 21221020200223. The reversal of 21221020200210 is 1200202012212.

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 21221020200210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353683669974 + ... + 353683670033.

It is an arithmetic number, because the mean of its divisors is an integer number (3183153030036).

Almost surely, 2^{21221020200210} is an apocalyptic number.

21221020200210 is an abundant number, since it is smaller than the sum of its proper divisors (29709428280366).

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

21221020200210 is a wasteful number, since it uses less digits than its factorization.

21221020200210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707367340017.

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

Adding to 21221020200210 its reverse (1200202012212), we get a palindrome (22421222212422).

The spelling of 21221020200210 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred thousand, two hundred ten".