22211112221221 has 48 divisors (see below), whose sum is σ = 29424963277440. Its totient is φ = 16284606750720.

The previous prime is 22211112221203. The next prime is 22211112221351. The reversal of 22211112221221 is 12212221111222.

It is not a de Polignac number, because 22211112221221 - 2⁵ = 22211112221189 is a prime.

It is a super-2 number, since 2×22211112221221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22211112221192 and 22211112221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211112231221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78389421 + ... + 78672253.

It is an arithmetic number, because the mean of its divisors is an integer number (613020068280).

Almost surely, 2^{22211112221221} is an apocalyptic number.

It is an amenable number.

22211112221221 is a deficient number, since it is larger than the sum of its proper divisors (7213851056219).

22211112221221 is a wasteful number, since it uses less digits than its factorization.

22211112221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286414 (or 286397 counting only the distinct ones).

The product of its digits is 256, while the sum is 22.

Adding to 22211112221221 its reverse (12212221111222), we get a palindrome (34423333332443).

The spelling of 22211112221221 in words is "twenty-two trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".