2016821217 has 16 divisors (see below), whose sum is σ = 2871272448. Its totient is φ = 1256178000.

The previous prime is 2016821167. The next prime is 2016821239. The reversal of 2016821217 is 7121286102.

It is not a de Polignac number, because 2016821217 - 2²⁰ = 2015772641 is a prime.

It is a super-2 number, since 2×2016821217² = 8135135642682722178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2016823217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336909 + ... + 342842.

It is an arithmetic number, because the mean of its divisors is an integer number (179454528).

Almost surely, 2^2016821217 is an apocalyptic number.

It is an amenable number.

2016821217 is a deficient number, since it is larger than the sum of its proper divisors (854451231).

2016821217 is a wasteful number, since it uses less digits than its factorization.

2016821217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679820.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 2016821217 is about 44909.0326883134. The cubic root of 2016821217 is about 1263.4434273923.

The spelling of 2016821217 in words is "two billion, sixteen million, eight hundred twenty-one thousand, two hundred seventeen".