21222111100210 has 32 divisors (see below), whose sum is σ = 40262638915440. Its totient is φ = 8041481779968.

The previous prime is 21222111100153. The next prime is 21222111100247. The reversal of 21222111100210 is 1200111122212.

It can be written as a sum of positive squares in 8 ways, for example, as 12011693392521 + 9210417707689 = 3465789^2 + 3034867^2 .

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, 690359097 + ... + 690389836.

Almost surely, 2^{21222111100210} is an apocalyptic number.

21222111100210 is a deficient number, since it is larger than the sum of its proper divisors (19040527815230).

21222111100210 is a wasteful number, since it uses less digits than its factorization.

21222111100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380749022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21222111100210 its reverse (1200111122212), we get a palindrome (22422222222422).

The spelling of 21222111100210 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, one hundred thousand, two hundred ten".