236421145 has 4 divisors (see below), whose sum is σ = 283705380. Its totient is φ = 189136912.

The previous prime is 236421121. The next prime is 236421149. The reversal of 236421145 is 541124632.

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 74011609 + 162409536 = 8603^2 + 12744^2 .

It is a cyclic number.

It is not a de Polignac number, because 236421145 - 2⁹ = 236420633 is a prime.

It is a super-2 number, since 2×236421145² = 111789915606222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (236421149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23642110 + ... + 23642119.

It is an arithmetic number, because the mean of its divisors is an integer number (70926345).

Almost surely, 2^236421145 is an apocalyptic number.

It is an amenable number.

236421145 is a deficient number, since it is larger than the sum of its proper divisors (47284235).

236421145 is an equidigital number, since it uses as much as digits as its factorization.

236421145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47284234.

The product of its digits is 5760, while the sum is 28.

The square root of 236421145 is about 15375.9924882916. The cubic root of 236421145 is about 618.3420366898.

Adding to 236421145 its reverse (541124632), we get a palindrome (777545777).

The spelling of 236421145 in words is "two hundred thirty-six million, four hundred twenty-one thousand, one hundred forty-five".