401221231 has 2 divisors, whose sum is σ = 401221232. Its totient is φ = 401221230.

The previous prime is 401221207. The next prime is 401221237. The reversal of 401221231 is 132122104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401221231 - 2⁷ = 401221103 is a prime.

It is a super-2 number, since 2×401221231² = 321956952410310722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401221237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200610615 + 200610616.

It is an arithmetic number, because the mean of its divisors is an integer number (200610616).

Almost surely, 2^401221231 is an apocalyptic number.

401221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

401221231 is an equidigital number, since it uses as much as digits as its factorization.

401221231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 401221231 is about 20030.5075073000. The cubic root of 401221231 is about 737.5553801562. Note that the first 3 decimals are identical.

Adding to 401221231 its reverse (132122104), we get a palindrome (533343335).

The spelling of 401221231 in words is "four hundred one million, two hundred twenty-one thousand, two hundred thirty-one".