216570013 has 4 divisors (see below), whose sum is σ = 236258208. Its totient is φ = 196881820.

The previous prime is 216569993. The next prime is 216570023. The reversal of 216570013 is 310075612.

216570013 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 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-216570013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216570013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216570023) 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, 9844081 + ... + 9844102.

It is an arithmetic number, because the mean of its divisors is an integer number (59064552).

Almost surely, 2^216570013 is an apocalyptic number.

It is an amenable number.

216570013 is a deficient number, since it is larger than the sum of its proper divisors (19688195).

216570013 is a wasteful number, since it uses less digits than its factorization.

216570013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19688194.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 216570013 is about 14716.3179158375. The cubic root of 216570013 is about 600.5273262241.

The spelling of 216570013 in words is "two hundred sixteen million, five hundred seventy thousand, thirteen".