213038237 has 4 divisors (see below), whose sum is σ = 225569916. Its totient is φ = 200506560.

The previous prime is 213038233. The next prime is 213038239. The reversal of 213038237 is 732830312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94206436 + 118831801 = 9706^2 + 10901^2 .

It is a cyclic number.

It is not a de Polignac number, because 213038237 - 2² = 213038233 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213038233) 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, 6265814 + ... + 6265847.

It is an arithmetic number, because the mean of its divisors is an integer number (56392479).

Almost surely, 2^213038237 is an apocalyptic number.

It is an amenable number.

213038237 is a deficient number, since it is larger than the sum of its proper divisors (12531679).

213038237 is a wasteful number, since it uses less digits than its factorization.

213038237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12531678.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 213038237 is about 14595.8294385759. The cubic root of 213038237 is about 597.2449961364.

Adding to 213038237 its reverse (732830312), we get a palindrome (945868549).

The spelling of 213038237 in words is "two hundred thirteen million, thirty-eight thousand, two hundred thirty-seven".