43135351221 has 4 divisors (see below), whose sum is σ = 57513801632. Its totient is φ = 28756900812.

The previous prime is 43135351213. The next prime is 43135351223. The reversal of 43135351221 is 12215353134.

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 43135351221 - 2³ = 43135351213 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 (43135351223) 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, 7189225201 + ... + 7189225206.

It is an arithmetic number, because the mean of its divisors is an integer number (14378450408).

Almost surely, 2^43135351221 is an apocalyptic number.

It is an amenable number.

43135351221 is a deficient number, since it is larger than the sum of its proper divisors (14378450411).

43135351221 is a wasteful number, since it uses less digits than its factorization.

43135351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14378450410.

The product of its digits is 10800, while the sum is 30.

The spelling of 43135351221 in words is "forty-three billion, one hundred thirty-five million, three hundred fifty-one thousand, two hundred twenty-one".