342401221 has 4 divisors (see below), whose sum is σ = 342487372. Its totient is φ = 342315072.

The previous prime is 342401201. The next prime is 342401237. The reversal of 342401221 is 122104243.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122104243 = 5659 ⋅21577.

It can be written as a sum of positive squares in 2 ways, for example, as 199120321 + 143280900 = 14111^2 + 11970^2 .

It is a cyclic number.

It is not a de Polignac number, because 342401221 - 2⁷ = 342401093 is a prime.

It is a super-2 number, since 2×342401221² = 234477192284581682, 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 (342401201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36810 + ... + 45163.

It is an arithmetic number, because the mean of its divisors is an integer number (85621843).

Almost surely, 2^342401221 is an apocalyptic number.

It is an amenable number.

342401221 is a deficient number, since it is larger than the sum of its proper divisors (86151).

342401221 is an equidigital number, since it uses as much as digits as its factorization.

342401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86150.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 342401221 is about 18504.0866026940. The cubic root of 342401221 is about 699.5924300884.

Adding to 342401221 its reverse (122104243), we get a palindrome (464505464).

The spelling of 342401221 in words is "three hundred forty-two million, four hundred one thousand, two hundred twenty-one".