22220111121221 has 8 divisors (see below), whose sum is σ = 23937839073120. Its totient is φ = 20503595831472.

The previous prime is 22220111121203. The next prime is 22220111121287. The reversal of 22220111121221 is 12212111102222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22220111121221 - 2¹⁰ = 22220111120197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22220111121193 and 22220111121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220111151221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303127475 + ... + 303200768.

It is an arithmetic number, because the mean of its divisors is an integer number (2992229884140).

Almost surely, 2^{22220111121221} is an apocalyptic number.

It is an amenable number.

22220111121221 is a deficient number, since it is larger than the sum of its proper divisors (1717727951899).

22220111121221 is a wasteful number, since it uses less digits than its factorization.

22220111121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606331075.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22220111121221 its reverse (12212111102222), we get a palindrome (34432222223443).

The spelling of 22220111121221 in words is "twenty-two trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".