401221 has 4 divisors (see below), whose sum is σ = 406944. Its totient is φ = 395500.

The previous prime is 401209. The next prime is 401231. The reversal of 401221 is 122104.

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 401221 - 2¹¹ = 399173 is a prime.

It is a Duffinian number.

401221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 401198 and 401207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401201) 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, 2755 + ... + 2896.

It is an arithmetic number, because the mean of its divisors is an integer number (101736).

2⁴⁰¹²²¹ is an apocalyptic number.

It is an amenable number.

401221 is a deficient number, since it is larger than the sum of its proper divisors (5723).

401221 is an equidigital number, since it uses as much as digits as its factorization.

401221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 401221 is about 633.4200817783. The cubic root of 401221 is about 73.7555238609.

Adding to 401221 its reverse (122104), we get a palindrome (523325).

The spelling of 401221 in words is "four hundred one thousand, two hundred twenty-one", and thus it is an iban number.