17347447921 has 4 divisors (see below), whose sum is σ = 18367886052. Its totient is φ = 16327009792.

The previous prime is 17347447913. The next prime is 17347447993. The reversal of 17347447921 is 12974474371.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12974474371 = 59417 ⋅218363.

It can be written as a sum of positive squares in 2 ways, for example, as 11736688896 + 5610759025 = 108336^2 + 74905^2 .

It is a cyclic number.

It is not a de Polignac number, because 17347447921 - 2³ = 17347447913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17347447421) 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, 510219040 + ... + 510219073.

It is an arithmetic number, because the mean of its divisors is an integer number (4591971513).

Almost surely, 2^17347447921 is an apocalyptic number.

It is an amenable number.

17347447921 is a deficient number, since it is larger than the sum of its proper divisors (1020438131).

17347447921 is a wasteful number, since it uses less digits than its factorization.

17347447921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020438130.

The product of its digits is 1185408, while the sum is 49.

The spelling of 17347447921 in words is "seventeen billion, three hundred forty-seven million, four hundred forty-seven thousand, nine hundred twenty-one".