213040243 has 16 divisors (see below), whose sum is σ = 246921696. Its totient is φ = 182039040.

The previous prime is 213040229. The next prime is 213040249. The reversal of 213040243 is 342040312.

It is a cyclic number.

It is not a de Polignac number, because 213040243 - 2⁵ = 213040211 is a prime.

It is a super-2 number, since 2×213040243² = 90772290274998098, which contains 22 as substring.

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 213040243.

It is not an unprimeable number, because it can be changed into a prime (213040249) 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, 5580 + ... + 21382.

It is an arithmetic number, because the mean of its divisors is an integer number (15432606).

Almost surely, 2^213040243 is an apocalyptic number.

213040243 is a deficient number, since it is larger than the sum of its proper divisors (33881453).

213040243 is a wasteful number, since it uses less digits than its factorization.

213040243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15894.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 213040243 is about 14595.8981566740. The cubic root of 213040243 is about 597.2468707133.

Adding to 213040243 its reverse (342040312), we get a palindrome (555080555).

The spelling of 213040243 in words is "two hundred thirteen million, forty thousand, two hundred forty-three".