342191221 has 4 divisors (see below), whose sum is σ = 345330700. Its totient is φ = 339051744.

The previous prime is 342191219. The next prime is 342191231. The reversal of 342191221 is 122191243.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122191243 = 31 ⋅3941653.

It can be written as a sum of positive squares in 2 ways, for example, as 228342321 + 113848900 = 15111^2 + 10670^2 .

It is a cyclic number.

It is not a de Polignac number, because 342191221 - 2¹ = 342191219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (342191231) 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, 1569576 + ... + 1569793.

It is an arithmetic number, because the mean of its divisors is an integer number (86332675).

Almost surely, 2^342191221 is an apocalyptic number.

It is an amenable number.

342191221 is a deficient number, since it is larger than the sum of its proper divisors (3139479).

342191221 is a wasteful number, since it uses less digits than its factorization.

342191221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139478.

The product of its digits is 864, while the sum is 25.

The square root of 342191221 is about 18498.4113101639. The cubic root of 342191221 is about 699.4493771955.

The spelling of 342191221 in words is "three hundred forty-two million, one hundred ninety-one thousand, two hundred twenty-one".