222220001 has 4 divisors (see below), whose sum is σ = 227387952. Its totient is φ = 217052052.

The previous prime is 222219961. The next prime is 222220013. The reversal of 222220001 is 100022222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100022222 = 2 ⋅50011111.

It is a cyclic number.

It is not a de Polignac number, because 222220001 - 2¹⁰ = 222218977 is a prime.

It is a super-5 number, since 5×222220001⁵ (a number of 43 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2583911 + ... + 2583996.

It is an arithmetic number, because the mean of its divisors is an integer number (56846988).

Almost surely, 2^222220001 is an apocalyptic number.

It is an amenable number.

222220001 is a deficient number, since it is larger than the sum of its proper divisors (5167951).

222220001 is an equidigital number, since it uses as much as digits as its factorization.

222220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167950.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 222220001 is about 14907.0453477542. The cubic root of 222220001 is about 605.7048461563.

Adding to 222220001 its reverse (100022222), we get a palindrome (322242223).

The spelling of 222220001 in words is "two hundred twenty-two million, two hundred twenty thousand, one".