22012220221 has 4 divisors (see below), whose sum is σ = 22290856000. Its totient is φ = 21733584444.

The previous prime is 22012220207. The next prime is 22012220239. The reversal of 22012220221 is 12202221022.

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 22012220221 - 2¹⁹ = 22011695933 is a prime.

It is a super-3 number, since 3×22012220221³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012220195 and 22012220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012220921) 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, 139317771 + ... + 139317928.

It is an arithmetic number, because the mean of its divisors is an integer number (5572714000).

Almost surely, 2^22012220221 is an apocalyptic number.

It is an amenable number.

22012220221 is a deficient number, since it is larger than the sum of its proper divisors (278635779).

22012220221 is an equidigital number, since it uses as much as digits as its factorization.

22012220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278635778.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22012220221 its reverse (12202221022), we get a palindrome (34214441243).

The spelling of 22012220221 in words is "twenty-two billion, twelve million, two hundred twenty thousand, two hundred twenty-one".