243121244145 has 64 divisors (see below), whose sum is σ = 443274854400. Its totient is φ = 112796962560.

The previous prime is 243121244143. The next prime is 243121244147. The reversal of 243121244145 is 541442121342.

It is an interprime number because it is at equal distance from previous prime (243121244143) and next prime (243121244147).

It is not a de Polignac number, because 243121244145 - 2¹ = 243121244143 is a prime.

It is a super-2 number, since 2×243121244145² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243121244141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 535876 + ... + 879434.

It is an arithmetic number, because the mean of its divisors is an integer number (6926169600).

Almost surely, 2^243121244145 is an apocalyptic number.

It is an amenable number.

243121244145 is a deficient number, since it is larger than the sum of its proper divisors (200153610255).

243121244145 is a wasteful number, since it uses less digits than its factorization.

243121244145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343790.

The product of its digits is 30720, while the sum is 33.

Adding to 243121244145 its reverse (541442121342), we get a palindrome (784563365487).

The spelling of 243121244145 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-four thousand, one hundred forty-five".