243121255351 has 16 divisors (see below), whose sum is σ = 265766508000. Its totient is φ = 221040281088.

The previous prime is 243121255339. The next prime is 243121255361. The reversal of 243121255351 is 153552121342.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121255351 is a prime.

It is a super-2 number, since 2×243121255351² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121255331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8843475 + ... + 8870923.

It is an arithmetic number, because the mean of its divisors is an integer number (16610406750).

Almost surely, 2^243121255351 is an apocalyptic number.

243121255351 is a deficient number, since it is larger than the sum of its proper divisors (22645252649).

243121255351 is a wasteful number, since it uses less digits than its factorization.

243121255351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37698.

The product of its digits is 36000, while the sum is 34.

Adding to 243121255351 its reverse (153552121342), we get a palindrome (396673376693).

The spelling of 243121255351 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred fifty-five thousand, three hundred fifty-one".