2016870521 has 4 divisors (see below), whose sum is σ = 2017147392. Its totient is φ = 2016593652.

The previous prime is 2016870469. The next prime is 2016870587. The reversal of 2016870521 is 1250786102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2016870521 is a prime.

It is a super-2 number, since 2×2016870521² = 8135533396957622882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2016879521) 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, 127205 + ... + 142178.

It is an arithmetic number, because the mean of its divisors is an integer number (504286848).

Almost surely, 2^2016870521 is an apocalyptic number.

It is an amenable number.

2016870521 is a deficient number, since it is larger than the sum of its proper divisors (276871).

2016870521 is an equidigital number, since it uses as much as digits as its factorization.

2016870521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276870.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 2016870521 is about 44909.5816168443. The cubic root of 2016870521 is about 1263.4537228524.

The spelling of 2016870521 in words is "two billion, sixteen million, eight hundred seventy thousand, five hundred twenty-one".