216426237 has 4 divisors (see below), whose sum is σ = 288568320. Its totient is φ = 144284156.

The previous prime is 216426233. The next prime is 216426253. The reversal of 216426237 is 732624612.

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 not a de Polignac number, because 216426237 - 2² = 216426233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216426198 and 216426207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216426233) 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, 36071037 + ... + 36071042.

It is an arithmetic number, because the mean of its divisors is an integer number (72142080).

Almost surely, 2^216426237 is an apocalyptic number.

It is an amenable number.

216426237 is a deficient number, since it is larger than the sum of its proper divisors (72142083).

216426237 is an equidigital number, since it uses as much as digits as its factorization.

216426237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72142082.

The product of its digits is 24192, while the sum is 33.

The square root of 216426237 is about 14711.4321872481. The cubic root of 216426237 is about 600.3944045738.

The spelling of 216426237 in words is "two hundred sixteen million, four hundred twenty-six thousand, two hundred thirty-seven".