347142221 has 2 divisors, whose sum is σ = 347142222. Its totient is φ = 347142220.

The previous prime is 347142199. The next prime is 347142259. The reversal of 347142221 is 122241743.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175165225 + 171976996 = 13235^2 + 13114^2 .

It is a cyclic number.

It is not a de Polignac number, because 347142221 - 2²⁶ = 280033357 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (347142721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173571110 + 173571111.

It is an arithmetic number, because the mean of its divisors is an integer number (173571111).

Almost surely, 2^347142221 is an apocalyptic number.

It is an amenable number.

347142221 is a deficient number, since it is larger than the sum of its proper divisors (1).

347142221 is an equidigital number, since it uses as much as digits as its factorization.

347142221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 347142221 is about 18631.7530307805. The cubic root of 347142221 is about 702.8065697566.

Adding to 347142221 its reverse (122241743), we get a palindrome (469383964).

The spelling of 347142221 in words is "three hundred forty-seven million, one hundred forty-two thousand, two hundred twenty-one".