342121421 has 2 divisors, whose sum is σ = 342121422. Its totient is φ = 342121420.

The previous prime is 342121361. The next prime is 342121427. The reversal of 342121421 is 124121243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270109225 + 72012196 = 16435^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 342121421 - 2⁶ = 342121357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 342121393 and 342121402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342121427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171060710 + 171060711.

It is an arithmetic number, because the mean of its divisors is an integer number (171060711).

Almost surely, 2^342121421 is an apocalyptic number.

It is an amenable number.

342121421 is a deficient number, since it is larger than the sum of its proper divisors (1).

342121421 is an equidigital number, since it uses as much as digits as its factorization.

342121421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 20.

The square root of 342121421 is about 18496.5245654420. The cubic root of 342121421 is about 699.4018161795.

Adding to 342121421 its reverse (124121243), we get a palindrome (466242664).

It can be divided in two parts, 3421 and 21421, that added together give a palindrome (24842).

The spelling of 342121421 in words is "three hundred forty-two million, one hundred twenty-one thousand, four hundred twenty-one".