347536721621 has 2 divisors, whose sum is σ = 347536721622. Its totient is φ = 347536721620.

The previous prime is 347536721603. The next prime is 347536721633. The reversal of 347536721621 is 126127635743.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285679560100 + 61857161521 = 534490^2 + 248711^2 .

It is a cyclic number.

It is not a de Polignac number, because 347536721621 - 2³⁴ = 330356852437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (347536721641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173768360810 + 173768360811.

It is an arithmetic number, because the mean of its divisors is an integer number (173768360811).

Almost surely, 2^347536721621 is an apocalyptic number.

It is an amenable number.

347536721621 is a deficient number, since it is larger than the sum of its proper divisors (1).

347536721621 is an equidigital number, since it uses as much as digits as its factorization.

347536721621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 47.

The spelling of 347536721621 in words is "three hundred forty-seven billion, five hundred thirty-six million, seven hundred twenty-one thousand, six hundred twenty-one".