22220001221 has 4 divisors (see below), whose sum is σ = 24240001344. Its totient is φ = 20200001100.

The previous prime is 22220001211. The next prime is 22220001229. The reversal of 22220001221 is 12210002222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22220001221 - 2³⁰ = 21146259397 is a prime.

It is a super-2 number, since 2×22220001221² (a number of 21 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 = 22220001196 and 22220001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220001229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010000045 + ... + 1010000066.

It is an arithmetic number, because the mean of its divisors is an integer number (6060000336).

Almost surely, 2^22220001221 is an apocalyptic number.

It is an amenable number.

22220001221 is a deficient number, since it is larger than the sum of its proper divisors (2020000123).

22220001221 is a wasteful number, since it uses less digits than its factorization.

22220001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020000122.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 22220001221 its reverse (12210002222), we get a palindrome (34430003443).

The spelling of 22220001221 in words is "twenty-two billion, two hundred twenty million, one thousand, two hundred twenty-one".