43145044021 has 4 divisors (see below), whose sum is σ = 43219819372. Its totient is φ = 43070268672.

The previous prime is 43145044009. The next prime is 43145044081. The reversal of 43145044021 is 12044054134.

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 35385372100 + 7759671921 = 188110^2 + 88089^2 .

It is a cyclic number.

It is not a de Polignac number, because 43145044021 - 2⁵ = 43145043989 is a prime.

It is a super-2 number, since 2×43145044021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43145044081) 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, 37386810 + ... + 37387963.

It is an arithmetic number, because the mean of its divisors is an integer number (10804954843).

Almost surely, 2^43145044021 is an apocalyptic number.

It is an amenable number.

43145044021 is a deficient number, since it is larger than the sum of its proper divisors (74775351).

43145044021 is an equidigital number, since it uses as much as digits as its factorization.

43145044021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74775350.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 43145044021 its reverse (12044054134), we get a palindrome (55189098155).

The spelling of 43145044021 in words is "forty-three billion, one hundred forty-five million, forty-four thousand, twenty-one".