43254315421 has 4 divisors (see below), whose sum is σ = 43262104732. Its totient is φ = 43246526112.

The previous prime is 43254315409. The next prime is 43254315443. The reversal of 43254315421 is 12451345234.

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 42060267396 + 1194048025 = 205086^2 + 34555^2 .

It is a cyclic number.

It is not a de Polignac number, because 43254315421 - 2⁵ = 43254315389 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 (43254375421) 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, 3886320 + ... + 3897433.

It is an arithmetic number, because the mean of its divisors is an integer number (10815526183).

Almost surely, 2^43254315421 is an apocalyptic number.

It is an amenable number.

43254315421 is a deficient number, since it is larger than the sum of its proper divisors (7789311).

43254315421 is an equidigital number, since it uses as much as digits as its factorization.

43254315421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7789310.

The product of its digits is 57600, while the sum is 34.

The spelling of 43254315421 in words is "forty-three billion, two hundred fifty-four million, three hundred fifteen thousand, four hundred twenty-one".