43641105421 has 2 divisors, whose sum is σ = 43641105422. Its totient is φ = 43641105420.

The previous prime is 43641105419. The next prime is 43641105479. The reversal of 43641105421 is 12450114634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33683260900 + 9957844521 = 183530^2 + 99789^2 .

It is a cyclic number.

It is not a de Polignac number, because 43641105421 - 2¹ = 43641105419 is a prime.

Together with 43641105419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43641105121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21820552710 + 21820552711.

It is an arithmetic number, because the mean of its divisors is an integer number (21820552711).

Almost surely, 2^43641105421 is an apocalyptic number.

It is an amenable number.

43641105421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43641105421 is an equidigital number, since it uses as much as digits as its factorization.

43641105421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 43641105421 in words is "forty-three billion, six hundred forty-one million, one hundred five thousand, four hundred twenty-one".