213516802409 has 16 divisors (see below), whose sum is σ = 216692775936. Its totient is φ = 210369642000.

The previous prime is 213516802403. The next prime is 213516802427. The reversal of 213516802409 is 904208615312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213516802409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213516802403) 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, 11767274 + ... + 11785404.

It is an arithmetic number, because the mean of its divisors is an integer number (13543298496).

Almost surely, 2^213516802409 is an apocalyptic number.

It is an amenable number.

213516802409 is a deficient number, since it is larger than the sum of its proper divisors (3175973527).

213516802409 is a wasteful number, since it uses less digits than its factorization.

213516802409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18916.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 213516802409 in words is "two hundred thirteen billion, five hundred sixteen million, eight hundred two thousand, four hundred nine".