243051221425 has 12 divisors (see below), whose sum is σ = 301390247116. Its totient is φ = 194436633600.

The previous prime is 243051221389. The next prime is 243051221449. The reversal of 243051221425 is 524122150342.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 37785139456 + 205266081969 = 194384^2 + 453063^2 .

It is not a de Polignac number, because 243051221425 - 2⁹ = 243051220913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1500385 + ... + 1654465.

Almost surely, 2^243051221425 is an apocalyptic number.

243051221425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243051221425 is a deficient number, since it is larger than the sum of its proper divisors (58339025691).

243051221425 is a wasteful number, since it uses less digits than its factorization.

243051221425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217188 (or 217183 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 243051221425 its reverse (524122150342), we get a palindrome (767173371767).

The spelling of 243051221425 in words is "two hundred forty-three billion, fifty-one million, two hundred twenty-one thousand, four hundred twenty-five".