347147317021 has 12 divisors (see below), whose sum is σ = 369863322868. Its totient is φ = 325757279232.

The previous prime is 347147316949. The next prime is 347147317057. The reversal of 347147317021 is 120713741743.

It can be written as a sum of positive squares in 6 ways, for example, as 8365114521 + 338782202500 = 91461^2 + 582050^2 .

It is a de Polignac number, because none of the positive numbers 2^k-347147317021 is a prime.

It is a super-2 number, since 2×347147317021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (347147317921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1684806 + ... + 1879591.

Almost surely, 2^347147317021 is an apocalyptic number.

It is an amenable number.

347147317021 is a deficient number, since it is larger than the sum of its proper divisors (22716005847).

347147317021 is a wasteful number, since it uses less digits than its factorization.

347147317021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564768 (or 3564751 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 40.

The spelling of 347147317021 in words is "three hundred forty-seven billion, one hundred forty-seven million, three hundred seventeen thousand, twenty-one".