222401221 has 4 divisors (see below), whose sum is σ = 254172832. Its totient is φ = 190629612.

The previous prime is 222401209. The next prime is 222401233. The reversal of 222401221 is 122104222.

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 an interprime number because it is at equal distance from previous prime (222401209) and next prime (222401233).

It is a cyclic number.

It is not a de Polignac number, because 222401221 - 2⁹ = 222400709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222401195 and 222401204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222402221) 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, 15885795 + ... + 15885808.

It is an arithmetic number, because the mean of its divisors is an integer number (63543208).

Almost surely, 2^222401221 is an apocalyptic number.

It is an amenable number.

222401221 is a deficient number, since it is larger than the sum of its proper divisors (31771611).

222401221 is an equidigital number, since it uses as much as digits as its factorization.

222401221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31771610.

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

The square root of 222401221 is about 14913.1224430030. The cubic root of 222401221 is about 605.8694518133.

Adding to 222401221 its reverse (122104222), we get a palindrome (344505443).

The spelling of 222401221 in words is "two hundred twenty-two million, four hundred one thousand, two hundred twenty-one".