22000000221 has 10 divisors (see below), whose sum is σ = 32864197982. Its totient is φ = 14666666760.

The previous prime is 22000000199. The next prime is 22000000229. The reversal of 22000000221 is 12200000022.

It can be written as a sum of positive squares in only one way, i.e., 21244520025 + 755480196 = 145755^2 + 27486^2 .

It is not a de Polignac number, because 22000000221 - 2¹³ = 21999992029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000000229) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 135802390 + ... + 135802551.

Almost surely, 2^22000000221 is an apocalyptic number.

It is an amenable number.

22000000221 is a deficient number, since it is larger than the sum of its proper divisors (10864197761).

22000000221 is an equidigital number, since it uses as much as digits as its factorization.

22000000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271604953 (or 271604944 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 22000000221 its reverse (12200000022), we get a palindrome (34200000243).

The spelling of 22000000221 in words is "twenty-two billion, two hundred twenty-one", and thus it is an aban number.