115194776021 has 4 divisors (see below), whose sum is σ = 124055912652. Its totient is φ = 106333639392.

The previous prime is 115194776017. The next prime is 115194776033. The reversal of 115194776021 is 120677491511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120677491511 = 23 ⋅5246847457.

It can be written as a sum of positive squares in 2 ways, for example, as 64267827121 + 50926948900 = 253511^2 + 225670^2 .

It is a cyclic number.

It is not a de Polignac number, because 115194776021 - 2² = 115194776017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115194776041) 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, 4430568296 + ... + 4430568321.

It is an arithmetic number, because the mean of its divisors is an integer number (31013978163).

Almost surely, 2^115194776021 is an apocalyptic number.

It is an amenable number.

115194776021 is a deficient number, since it is larger than the sum of its proper divisors (8861136631).

115194776021 is an equidigital number, since it uses as much as digits as its factorization.

115194776021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861136630.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 115194776021 in words is "one hundred fifteen billion, one hundred ninety-four million, seven hundred seventy-six thousand, twenty-one".