115111021 has 4 divisors (see below), whose sum is σ = 120115872. Its totient is φ = 110106172.

The previous prime is 115110997. The next prime is 115111069. The reversal of 115111021 is 120111511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 115111021 - 2¹³ = 115102829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115110992 and 115111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115117021) 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, 2502391 + ... + 2502436.

It is an arithmetic number, because the mean of its divisors is an integer number (30028968).

Almost surely, 2^115111021 is an apocalyptic number.

It is an amenable number.

115111021 is a deficient number, since it is larger than the sum of its proper divisors (5004851).

115111021 is an equidigital number, since it uses as much as digits as its factorization.

115111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5004850.

The product of its (nonzero) digits is 10, while the sum is 13.

The square root of 115111021 is about 10728.9804268626. The cubic root of 115111021 is about 486.4508523202.

Adding to 115111021 its reverse (120111511), we get a palindrome (235222532).

The spelling of 115111021 in words is "one hundred fifteen million, one hundred eleven thousand, twenty-one".