22220212101221 has 16 divisors (see below), whose sum is σ = 22421542516848. Its totient is φ = 22019734464000.

The previous prime is 22220212101181. The next prime is 22220212101229. The reversal of 22220212101221 is 12210121202222.

It can be written as a sum of positive squares in 8 ways, for example, as 1059190888900 + 21161021212321 = 1029170^2 + 4600111^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220212101221 - 2¹⁰ = 22220212100197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22220212101193 and 22220212101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220212101229) 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, 755749121 + ... + 755778521.

It is an arithmetic number, because the mean of its divisors is an integer number (1401346407303).

Almost surely, 2^{22220212101221} is an apocalyptic number.

It is an amenable number.

22220212101221 is a deficient number, since it is larger than the sum of its proper divisors (201330415627).

22220212101221 is a wasteful number, since it uses less digits than its factorization.

22220212101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43672.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22220212101221 its reverse (12210121202222), we get a palindrome (34430333303443).

The spelling of 22220212101221 in words is "twenty-two trillion, two hundred twenty billion, two hundred twelve million, one hundred one thousand, two hundred twenty-one".