43436122021 has 2 divisors, whose sum is σ = 43436122022. Its totient is φ = 43436122020.

The previous prime is 43436122001. The next prime is 43436122027. The reversal of 43436122021 is 12022163434.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43403472225 + 32649796 = 208335^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 43436122021 - 2⁷ = 43436121893 is a prime.

It is a super-2 number, since 2×43436122021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43436122027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21718061010 + 21718061011.

It is an arithmetic number, because the mean of its divisors is an integer number (21718061011).

Almost surely, 2^43436122021 is an apocalyptic number.

It is an amenable number.

43436122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43436122021 is an equidigital number, since it uses as much as digits as its factorization.

43436122021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 43436122021 its reverse (12022163434), we get a palindrome (55458285455).

The spelling of 43436122021 in words is "forty-three billion, four hundred thirty-six million, one hundred twenty-two thousand, twenty-one".