43264521404821 has 2 divisors, whose sum is σ = 43264521404822. Its totient is φ = 43264521404820.

The previous prime is 43264521404813. The next prime is 43264521404843. The reversal of 43264521404821 is 12840412546234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22376778768100 + 20887742636721 = 4730410^2 + 4570311^2 .

It is a cyclic number.

It is not a de Polignac number, because 43264521404821 - 2³ = 43264521404813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43264521404861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21632260702410 + 21632260702411.

It is an arithmetic number, because the mean of its divisors is an integer number (21632260702411).

Almost surely, 2^{43264521404821} is an apocalyptic number.

It is an amenable number.

43264521404821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43264521404821 is an equidigital number, since it uses as much as digits as its factorization.

43264521404821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1474560, while the sum is 46.

The spelling of 43264521404821 in words is "forty-three trillion, two hundred sixty-four billion, five hundred twenty-one million, four hundred four thousand, eight hundred twenty-one".