43432021291 has 2 divisors, whose sum is σ = 43432021292. Its totient is φ = 43432021290.

The previous prime is 43432021223. The next prime is 43432021337. The reversal of 43432021291 is 19212023434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43432021291 - 2¹³ = 43432013099 is a prime.

It is not a weakly prime, because it can be changed into another prime (43432021201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21716010645 + 21716010646.

It is an arithmetic number, because the mean of its divisors is an integer number (21716010646).

Almost surely, 2^43432021291 is an apocalyptic number.

43432021291 is a deficient number, since it is larger than the sum of its proper divisors (1).

43432021291 is an equidigital number, since it uses as much as digits as its factorization.

43432021291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 43432021291 in words is "forty-three billion, four hundred thirty-two million, twenty-one thousand, two hundred ninety-one".