213684417 has 12 divisors (see below), whose sum is σ = 308886864. Its totient is φ = 142349400.

The previous prime is 213684377. The next prime is 213684433. The reversal of 213684417 is 714486312.

It is not a de Polignac number, because 213684417 - 2¹⁴ = 213668033 is a prime.

It is a super-2 number, since 2×213684417² = 91322060137259778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (213684487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4878 + ... + 21240.

It is an arithmetic number, because the mean of its divisors is an integer number (25740572).

Almost surely, 2^213684417 is an apocalyptic number.

It is an amenable number.

213684417 is a deficient number, since it is larger than the sum of its proper divisors (95202447).

213684417 is a wasteful number, since it uses less digits than its factorization.

213684417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17820 (or 17817 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 213684417 is about 14617.9484538700. The cubic root of 213684417 is about 597.8482340638.

The spelling of 213684417 in words is "two hundred thirteen million, six hundred eighty-four thousand, four hundred seventeen".