43913092021 has 2 divisors, whose sum is σ = 43913092022. Its totient is φ = 43913092020.

The previous prime is 43913092019. The next prime is 43913092043. The reversal of 43913092021 is 12029031934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43894859121 + 18232900 = 209511^2 + 4270^2 .

It is a cyclic number.

It is not a de Polignac number, because 43913092021 - 2¹ = 43913092019 is a prime.

Together with 43913092019, 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 (43913092001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21956546010 + 21956546011.

It is an arithmetic number, because the mean of its divisors is an integer number (21956546011).

Almost surely, 2^43913092021 is an apocalyptic number.

It is an amenable number.

43913092021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43913092021 is an equidigital number, since it uses as much as digits as its factorization.

43913092021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 43913092021 in words is "forty-three billion, nine hundred thirteen million, ninety-two thousand, twenty-one".