115511421 has 4 divisors (see below), whose sum is σ = 154015232. Its totient is φ = 77007612.

The previous prime is 115511419. The next prime is 115511471. The reversal of 115511421 is 124115511.

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 not a de Polignac number, because 115511421 - 2¹ = 115511419 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 (115511471) 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, 19251901 + ... + 19251906.

It is an arithmetic number, because the mean of its divisors is an integer number (38503808).

Almost surely, 2^115511421 is an apocalyptic number.

It is an amenable number.

115511421 is a deficient number, since it is larger than the sum of its proper divisors (38503811).

115511421 is an equidigital number, since it uses as much as digits as its factorization.

115511421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38503810.

The product of its digits is 200, while the sum is 21.

The square root of 115511421 is about 10747.6239699759. The cubic root of 115511421 is about 487.0142201054.

Adding to 115511421 its reverse (124115511), we get a palindrome (239626932).

The spelling of 115511421 in words is "one hundred fifteen million, five hundred eleven thousand, four hundred twenty-one".