21022221222210 has 64 divisors (see below), whose sum is σ = 54361703313792. Its totient is φ = 5172096139776.

The previous prime is 21022221222169. The next prime is 21022221222259. The reversal of 21022221222210 is 1222212222012.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12789019 + ... + 14338878.

It is an arithmetic number, because the mean of its divisors is an integer number (849401614278).

Almost surely, 2^{21022221222210} is an apocalyptic number.

21022221222210 is an abundant number, since it is smaller than the sum of its proper divisors (33339482091582).

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

21022221222210 is a wasteful number, since it uses less digits than its factorization.

21022221222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27129907.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21022221222210 its reverse (1222212222012), we get a palindrome (22244433444222).

The spelling of 21022221222210 in words is "twenty-one trillion, twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred ten".