342891221 has 4 divisors (see below), whose sum is σ = 342972192. Its totient is φ = 342810252.

The previous prime is 342891191. The next prime is 342891229. The reversal of 342891221 is 122198243.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122198243 = 647 ⋅188869.

It is a cyclic number.

It is not a de Polignac number, because 342891221 - 2¹⁴ = 342874837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342891229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33761 + ... + 42726.

It is an arithmetic number, because the mean of its divisors is an integer number (85743048).

Almost surely, 2^342891221 is an apocalyptic number.

It is an amenable number.

342891221 is a deficient number, since it is larger than the sum of its proper divisors (80971).

342891221 is an equidigital number, since it uses as much as digits as its factorization.

342891221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80970.

The product of its digits is 6912, while the sum is 32.

The square root of 342891221 is about 18517.3221876167. The cubic root of 342891221 is about 699.9259928562.

It can be divided in two parts, 3428 and 91221, that added together give a palindrome (94649).

The spelling of 342891221 in words is "three hundred forty-two million, eight hundred ninety-one thousand, two hundred twenty-one".