21222210020210 has 8 divisors (see below), whose sum is σ = 38199978036396. Its totient is φ = 8488884008080.

The previous prime is 21222210020191. The next prime is 21222210020213. The reversal of 21222210020210 is 1202001222212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19824052761241 + 1398157258969 = 4452421^2 + 1182437^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21222210020213) 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, 1061110501001 + ... + 1061110501020.

Almost surely, 2^{21222210020210} is an apocalyptic number.

21222210020210 is a deficient number, since it is larger than the sum of its proper divisors (16977768016186).

21222210020210 is a wasteful number, since it uses less digits than its factorization.

21222210020210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122221002028.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222210020210 its reverse (1202001222212), we get a palindrome (22424211242422).

The spelling of 21222210020210 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, twenty thousand, two hundred ten".