402221231 has 4 divisors (see below), whose sum is σ = 409038600. Its totient is φ = 395403864.

The previous prime is 402221189. The next prime is 402221257. The reversal of 402221231 is 132122204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402221231 - 2¹⁰ = 402220207 is a prime.

It is a super-2 number, since 2×402221231² = 323563837334310722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402221291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3408596 + ... + 3408713.

It is an arithmetic number, because the mean of its divisors is an integer number (102259650).

Almost surely, 2^402221231 is an apocalyptic number.

402221231 is a deficient number, since it is larger than the sum of its proper divisors (6817369).

402221231 is an equidigital number, since it uses as much as digits as its factorization.

402221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817368.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 402221231 is about 20055.4538966337. The cubic root of 402221231 is about 738.1676304656.

Adding to 402221231 its reverse (132122204), we get a palindrome (534343435).

The spelling of 402221231 in words is "four hundred two million, two hundred twenty-one thousand, two hundred thirty-one".