43418764025921 has 2 divisors, whose sum is σ = 43418764025922. Its totient is φ = 43418764025920.

The previous prime is 43418764025731. The next prime is 43418764025939. The reversal of 43418764025921 is 12952046781434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30515006873521 + 12903757152400 = 5524039^2 + 3592180^2 .

It is a cyclic number.

It is not a de Polignac number, because 43418764025921 - 2²² = 43418759831617 is a prime.

It is a super-2 number, since 2×43418764025921² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43418764025941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21709382012960 + 21709382012961.

It is an arithmetic number, because the mean of its divisors is an integer number (21709382012961).

It is a 1-persistent number, because it is pandigital, but 2⋅43418764025921 = 86837528051842 is not.

Almost surely, 2^{43418764025921} is an apocalyptic number.

It is an amenable number.

43418764025921 is a deficient number, since it is larger than the sum of its proper divisors (1).

43418764025921 is an equidigital number, since it uses as much as digits as its factorization.

43418764025921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 43418764025921 in words is "forty-three trillion, four hundred eighteen billion, seven hundred sixty-four million, twenty-five thousand, nine hundred twenty-one".