347400691021 has 4 divisors (see below), whose sum is σ = 347593586044. Its totient is φ = 347207796000.

The previous prime is 347400691013. The next prime is 347400691063. The reversal of 347400691021 is 120196004743.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 159192222121 + 188208468900 = 398989^2 + 433830^2 .

It is a cyclic number.

It is not a de Polignac number, because 347400691021 - 2³ = 347400691013 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 (347400691091) 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, 96444810 + ... + 96448411.

It is an arithmetic number, because the mean of its divisors is an integer number (86898396511).

Almost surely, 2^347400691021 is an apocalyptic number.

It is an amenable number.

347400691021 is a deficient number, since it is larger than the sum of its proper divisors (192895023).

347400691021 is a wasteful number, since it uses less digits than its factorization.

347400691021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192895022.

The product of its (nonzero) digits is 36288, while the sum is 37.

Adding to 347400691021 its reverse (120196004743), we get a palindrome (467596695764).

The spelling of 347400691021 in words is "three hundred forty-seven billion, four hundred million, six hundred ninety-one thousand, twenty-one".