342127721 has 4 divisors (see below), whose sum is σ = 368445252. Its totient is φ = 315810192.

The previous prime is 342127717. The next prime is 342127729. The reversal of 342127721 is 127721243.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13213225 + 328914496 = 3635^2 + 18136^2 .

It is a cyclic number.

It is not a de Polignac number, because 342127721 - 2² = 342127717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (342127729) 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, 13158746 + ... + 13158771.

It is an arithmetic number, because the mean of its divisors is an integer number (92111313).

Almost surely, 2^342127721 is an apocalyptic number.

It is an amenable number.

342127721 is a deficient number, since it is larger than the sum of its proper divisors (26317531).

342127721 is a wasteful number, since it uses less digits than its factorization.

342127721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26317530.

The product of its digits is 4704, while the sum is 29.

The square root of 342127721 is about 18496.6948669215. The cubic root of 342127721 is about 699.4061092016.

Adding to 342127721 its reverse (127721243), we get a palindrome (469848964).

The spelling of 342127721 in words is "three hundred forty-two million, one hundred twenty-seven thousand, seven hundred twenty-one".