342551221 has 2 divisors, whose sum is σ = 342551222. Its totient is φ = 342551220.

The previous prime is 342551179. The next prime is 342551233. The reversal of 342551221 is 122155243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341732196 + 819025 = 18486^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 342551221 - 2⁷ = 342551093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (342551021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171275610 + 171275611.

It is an arithmetic number, because the mean of its divisors is an integer number (171275611).

Almost surely, 2^342551221 is an apocalyptic number.

It is an amenable number.

342551221 is a deficient number, since it is larger than the sum of its proper divisors (1).

342551221 is an equidigital number, since it uses as much as digits as its factorization.

342551221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 342551221 is about 18508.1393176083. The cubic root of 342551221 is about 699.6945749191.

The spelling of 342551221 in words is "three hundred forty-two million, five hundred fifty-one thousand, two hundred twenty-one".