243212021145 has 96 divisors (see below), whose sum is σ = 452745925632. Its totient is φ = 125167799232.

The previous prime is 243212021131. The next prime is 243212021147. The reversal of 243212021145 is 541120212342.

243212021145 is a `hidden beast` number, since 2 + 432 + 12 + 0 + 211 + 4 + 5 = 666.

It is not a de Polignac number, because 243212021145 - 2¹⁸ = 243211759001 is a prime.

It is a super-2 number, since 2×243212021145² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (243212021147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4308292 + ... + 4364378.

It is an arithmetic number, because the mean of its divisors is an integer number (4716103392).

Almost surely, 2^243212021145 is an apocalyptic number.

It is an amenable number.

243212021145 is a deficient number, since it is larger than the sum of its proper divisors (209533904487).

243212021145 is an equidigital number, since it uses as much as digits as its factorization.

243212021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56233 (or 56221 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 243212021145 its reverse (541120212342), we get a palindrome (784332233487).

The spelling of 243212021145 in words is "two hundred forty-three billion, two hundred twelve million, twenty-one thousand, one hundred forty-five".