115243445021 has 4 divisors (see below), whose sum is σ = 115254430044. Its totient is φ = 115232460000.

The previous prime is 115243444999. The next prime is 115243445047. The reversal of 115243445021 is 120544342511.

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 69980882521 + 45262562500 = 264539^2 + 212750^2 .

It is a cyclic number.

It is not a de Polignac number, because 115243445021 - 2⁶ = 115243444957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115243445081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5476760 + ... + 5497761.

It is an arithmetic number, because the mean of its divisors is an integer number (28813607511).

Almost surely, 2^115243445021 is an apocalyptic number.

It is an amenable number.

115243445021 is a deficient number, since it is larger than the sum of its proper divisors (10985023).

115243445021 is a wasteful number, since it uses less digits than its factorization.

115243445021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10985022.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 115243445021 its reverse (120544342511), we get a palindrome (235787787532).

The spelling of 115243445021 in words is "one hundred fifteen billion, two hundred forty-three million, four hundred forty-five thousand, twenty-one".