21222200000221 has 16 divisors (see below), whose sum is σ = 23172872328000. Its totient is φ = 19275094713600.

The previous prime is 21222200000219. The next prime is 21222200000357. The reversal of 21222200000221 is 12200000222212.

It is not a de Polignac number, because 21222200000221 - 2¹ = 21222200000219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222200000195 and 21222200000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222200001221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130363486 + ... + 130526176.

It is an arithmetic number, because the mean of its divisors is an integer number (1448304520500).

Almost surely, 2^{21222200000221} is an apocalyptic number.

It is an amenable number.

21222200000221 is a deficient number, since it is larger than the sum of its proper divisors (1950672327779).

21222200000221 is a wasteful number, since it uses less digits than its factorization.

21222200000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173580.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21222200000221 its reverse (12200000222212), we get a palindrome (33422200222433).

The spelling of 21222200000221 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred million, two hundred twenty-one", and thus it is an aban number.