115421 has 2 divisors, whose sum is σ = 115422. Its totient is φ = 115420.

The previous prime is 115399. The next prime is 115429. The reversal of 115421 is 124511.

115421 is nontrivially palindromic in base 12.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96100 + 19321 = 310^2 + 139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 115396 and 115405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57710 + 57711.

It is an arithmetic number, because the mean of its divisors is an integer number (57711).

2¹¹⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

115421 is a deficient number, since it is larger than the sum of its proper divisors (1).

115421 is an equidigital number, since it uses as much as digits as its factorization.

115421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40, while the sum is 14.

The square root of 115421 is about 339.7366627257. The cubic root of 115421 is about 48.6887110573.

Adding to 115421 its reverse (124511), we get a palindrome (239932).

The spelling of 115421 in words is "one hundred fifteen thousand, four hundred twenty-one".