43077229021 has 4 divisors (see below), whose sum is σ = 44241478492. Its totient is φ = 41912979552.

The previous prime is 43077229007. The next prime is 43077229037. The reversal of 43077229021 is 12092277034.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12092277034 = 2 ⋅6046138517.

It can be written as a sum of positive squares in 2 ways, for example, as 41162728996 + 1914500025 = 202886^2 + 43755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43077229021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1164249433 = 43077229021 / (4 + 3 + 0 + 7 + 7 + 2 + 2 + 9 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43077229051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582124680 + ... + 582124753.

It is an arithmetic number, because the mean of its divisors is an integer number (11060369623).

Almost surely, 2^43077229021 is an apocalyptic number.

It is an amenable number.

43077229021 is a deficient number, since it is larger than the sum of its proper divisors (1164249471).

43077229021 is a wasteful number, since it uses less digits than its factorization.

43077229021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164249470.

The product of its (nonzero) digits is 42336, while the sum is 37.

The spelling of 43077229021 in words is "forty-three billion, seventy-seven million, two hundred twenty-nine thousand, twenty-one".