43421390391 has 16 divisors (see below), whose sum is σ = 59258091776. Its totient is φ = 28273841856.

The previous prime is 43421390381. The next prime is 43421390407. The reversal of 43421390391 is 19309312434.

It is not a de Polignac number, because 43421390391 - 2¹⁹ = 43420866103 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 (43421390381) 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 15 ways as a sum of consecutive naturals, for example, 939925 + ... + 985038.

It is an arithmetic number, because the mean of its divisors is an integer number (3703630736).

Almost surely, 2^43421390391 is an apocalyptic number.

43421390391 is a deficient number, since it is larger than the sum of its proper divisors (15836701385).

43421390391 is a wasteful number, since it uses less digits than its factorization.

43421390391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925142.

The product of its (nonzero) digits is 69984, while the sum is 39.

The spelling of 43421390391 in words is "forty-three billion, four hundred twenty-one million, three hundred ninety thousand, three hundred ninety-one".