2170421517 has 64 divisors (see below), whose sum is σ = 3372678144. Its totient is φ = 1229437440.

The previous prime is 2170421489. The next prime is 2170421521. The reversal of 2170421517 is 7151240712.

It is not a de Polignac number, because 2170421517 - 2⁶ = 2170421453 is a prime.

It is a super-2 number, since 2×2170421517² = 9421459122913162578, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170421527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3517393 + ... + 3518009.

It is an arithmetic number, because the mean of its divisors is an integer number (52698096).

Almost surely, 2^2170421517 is an apocalyptic number.

It is an amenable number.

2170421517 is a deficient number, since it is larger than the sum of its proper divisors (1202256627).

2170421517 is a wasteful number, since it uses less digits than its factorization.

2170421517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 2170421517 is about 46587.7829156958. The cubic root of 2170421517 is about 1294.7364126146.

The spelling of 2170421517 in words is "two billion, one hundred seventy million, four hundred twenty-one thousand, five hundred seventeen".