22221222101221 has 16 divisors (see below), whose sum is σ = 26260524843840. Its totient is φ = 18647179365360.

The previous prime is 22221222101201. The next prime is 22221222101227. The reversal of 22221222101221 is 12210122212222.

It is not a de Polignac number, because 22221222101221 - 2¹³ = 22221222093029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22221222101192 and 22221222101201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221222101227) 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, 459718915 + ... + 459767248.

It is an arithmetic number, because the mean of its divisors is an integer number (1641282802740).

Almost surely, 2^{22221222101221} is an apocalyptic number.

It is an amenable number.

22221222101221 is a deficient number, since it is larger than the sum of its proper divisors (4039302742619).

22221222101221 is an equidigital number, since it uses as much as digits as its factorization.

22221222101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919486213 (or 919486187 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 22221222101221 its reverse (12210122212222), we get a palindrome (34431344313443).

The spelling of 22221222101221 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred one thousand, two hundred twenty-one".