43942078421 has 2 divisors, whose sum is σ = 43942078422. Its totient is φ = 43942078420.

The previous prime is 43942078393. The next prime is 43942078429. The reversal of 43942078421 is 12487024934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30691536100 + 13250542321 = 175190^2 + 115111^2 .

It is a cyclic number.

It is not a de Polignac number, because 43942078421 - 2¹⁸ = 43941816277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43942078429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21971039210 + 21971039211.

It is an arithmetic number, because the mean of its divisors is an integer number (21971039211).

Almost surely, 2^43942078421 is an apocalyptic number.

It is an amenable number.

43942078421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43942078421 is an equidigital number, since it uses as much as digits as its factorization.

43942078421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 43942078421 in words is "forty-three billion, nine hundred forty-two million, seventy-eight thousand, four hundred twenty-one".