21222120022210 has 8 divisors (see below), whose sum is σ = 38199816039996. Its totient is φ = 8488848008880.

The previous prime is 21222120022199. The next prime is 21222120022247. The reversal of 21222120022210 is 1222002122212.

It can be written as a sum of positive squares in 2 ways, for example, as 20406116739969 + 816003282241 = 4517313^2 + 903329^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061106001101 + ... + 1061106001120.

Almost surely, 2^{21222120022210} is an apocalyptic number.

21222120022210 is a deficient number, since it is larger than the sum of its proper divisors (16977696017786).

21222120022210 is a wasteful number, since it uses less digits than its factorization.

21222120022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122212002228.

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

Adding to 21222120022210 its reverse (1222002122212), we get a palindrome (22444122144422).

The spelling of 21222120022210 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, twenty-two thousand, two hundred ten".