21222122020210 has 16 divisors (see below), whose sum is σ = 38199877589016. Its totient is φ = 8488835929728.

The previous prime is 21222122020193. The next prime is 21222122020219. The reversal of 21222122020210 is 1202022122212.

It can be written as a sum of positive squares in 4 ways, for example, as 21189754052289 + 32367967921 = 4603233^2 + 179911^2 .

It is not an unprimeable number, because it can be changed into a prime (21222122020219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8100532 + ... + 10395328.

Almost surely, 2^{21222122020210} is an apocalyptic number.

21222122020210 is a deficient number, since it is larger than the sum of its proper divisors (16977755568806).

21222122020210 is a wasteful number, since it uses less digits than its factorization.

21222122020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3219597.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21222122020210 its reverse (1202022122212), we get a palindrome (22424144142422).

The spelling of 21222122020210 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, twenty thousand, two hundred ten".