43653329921 has 2 divisors, whose sum is σ = 43653329922. Its totient is φ = 43653329920.

The previous prime is 43653329903. The next prime is 43653330023. The reversal of 43653329921 is 12992335634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22891690000 + 20761639921 = 151300^2 + 144089^2 .

It is a cyclic number.

It is not a de Polignac number, because 43653329921 - 2¹⁴ = 43653313537 is a prime.

It is a super-2 number, since 2×43653329921² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43653325921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21826664960 + 21826664961.

It is an arithmetic number, because the mean of its divisors is an integer number (21826664961).

Almost surely, 2^43653329921 is an apocalyptic number.

It is an amenable number.

43653329921 is a deficient number, since it is larger than the sum of its proper divisors (1).

43653329921 is an equidigital number, since it uses as much as digits as its factorization.

43653329921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 47.

The spelling of 43653329921 in words is "forty-three billion, six hundred fifty-three million, three hundred twenty-nine thousand, nine hundred twenty-one".