2143216571 has 4 divisors (see below), whose sum is σ = 2269288152. Its totient is φ = 2017144992.

The previous prime is 2143216561. The next prime is 2143216573. The reversal of 2143216571 is 1756123412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2143216571 - 2⁶ = 2143216507 is a prime.

It is a super-3 number, since 3×2143216571³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143216573) 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, 63035765 + ... + 63035798.

It is an arithmetic number, because the mean of its divisors is an integer number (567322038).

Almost surely, 2^2143216571 is an apocalyptic number.

2143216571 is a deficient number, since it is larger than the sum of its proper divisors (126071581).

2143216571 is a wasteful number, since it uses less digits than its factorization.

2143216571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126071580.

The product of its digits is 10080, while the sum is 32.

The square root of 2143216571 is about 46294.8870935009. The cubic root of 2143216571 is about 1289.3040676665.

Adding to 2143216571 its reverse (1756123412), we get a palindrome (3899339983).

The spelling of 2143216571 in words is "two billion, one hundred forty-three million, two hundred sixteen thousand, five hundred seventy-one".