8145133421 has 4 divisors (see below), whose sum is σ = 8207310144. Its totient is φ = 8082956700.

The previous prime is 8145133411. The next prime is 8145133433. The reversal of 8145133421 is 1243315418.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1243315418 = 2 ⋅621657709.

It is a cyclic number.

It is not a de Polignac number, because 8145133421 - 2¹⁰ = 8145132397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8145133411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31088165 + ... + 31088426.

It is an arithmetic number, because the mean of its divisors is an integer number (2051827536).

Almost surely, 2^8145133421 is an apocalyptic number.

It is an amenable number.

8145133421 is a deficient number, since it is larger than the sum of its proper divisors (62176723).

8145133421 is a wasteful number, since it uses less digits than its factorization.

8145133421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62176722.

The product of its digits is 11520, while the sum is 32.

The square root of 8145133421 is about 90250.3929132721. The cubic root of 8145133421 is about 2012.0220422056.

Adding to 8145133421 its reverse (1243315418), we get a palindrome (9388448839).

The spelling of 8145133421 in words is "eight billion, one hundred forty-five million, one hundred thirty-three thousand, four hundred twenty-one".