10521670217 has 4 divisors (see below), whose sum is σ = 10694156676. Its totient is φ = 10349183760.

The previous prime is 10521670199. The next prime is 10521670231. The reversal of 10521670217 is 71207612501.

10521670217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71207612501 = 19 ⋅3747769079.

It can be written as a sum of positive squares in 2 ways, for example, as 1577996176 + 8943674041 = 39724^2 + 94571^2 .

It is a cyclic number.

It is not a de Polignac number, because 10521670217 - 2¹² = 10521666121 is a prime.

It is a super-2 number, since 2×10521670217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10521670267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86243138 + ... + 86243259.

It is an arithmetic number, because the mean of its divisors is an integer number (2673539169).

Almost surely, 2^10521670217 is an apocalyptic number.

It is an amenable number.

10521670217 is a deficient number, since it is larger than the sum of its proper divisors (172486459).

10521670217 is an equidigital number, since it uses as much as digits as its factorization.

10521670217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172486458.

The product of its (nonzero) digits is 5880, while the sum is 32.

The spelling of 10521670217 in words is "ten billion, five hundred twenty-one million, six hundred seventy thousand, two hundred seventeen".