115215421 has 4 divisors (see below), whose sum is σ = 115245244. Its totient is φ = 115185600.

The previous prime is 115215391. The next prime is 115215433. The reversal of 115215421 is 124512511.

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 25704900 + 89510521 = 5070^2 + 9461^2 .

It is a cyclic number.

It is not a de Polignac number, because 115215421 - 2²⁵ = 81660989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115215392 and 115215401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115212421) 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, 8070 + ... + 17191.

It is an arithmetic number, because the mean of its divisors is an integer number (28811311).

Almost surely, 2^115215421 is an apocalyptic number.

It is an amenable number.

115215421 is a deficient number, since it is larger than the sum of its proper divisors (29823).

115215421 is an equidigital number, since it uses as much as digits as its factorization.

115215421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29822.

The product of its digits is 400, while the sum is 22.

The square root of 115215421 is about 10733.8446513819. The cubic root of 115215421 is about 486.5978701672.

Adding to 115215421 its reverse (124512511), we get a palindrome (239727932).

The spelling of 115215421 in words is "one hundred fifteen million, two hundred fifteen thousand, four hundred twenty-one".