347402021 has 4 divisors (see below), whose sum is σ = 367837452. Its totient is φ = 326966592.

The previous prime is 347402017. The next prime is 347402057. The reversal of 347402021 is 120204743.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120204743 = 41 ⋅2931823.

It can be written as a sum of positive squares in 2 ways, for example, as 310252996 + 37149025 = 17614^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 347402021 - 2² = 347402017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (347402071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10217690 + ... + 10217723.

It is an arithmetic number, because the mean of its divisors is an integer number (91959363).

Almost surely, 2^347402021 is an apocalyptic number.

It is an amenable number.

347402021 is a deficient number, since it is larger than the sum of its proper divisors (20435431).

347402021 is a wasteful number, since it uses less digits than its factorization.

347402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20435430.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 347402021 is about 18638.7236955753. The cubic root of 347402021 is about 702.9818520136.

Adding to 347402021 its reverse (120204743), we get a palindrome (467606764).

The spelling of 347402021 in words is "three hundred forty-seven million, four hundred two thousand, twenty-one".