43440215451421 has 24 divisors (see below), whose sum is σ = 45517568718944. Its totient is φ = 41454148649760.

The previous prime is 43440215451407. The next prime is 43440215451461. The reversal of 43440215451421 is 12415451204434.

43440215451421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43440215451421 - 2¹⁷ = 43440215320349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43440215451461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 389064415 + ... + 389176051.

Almost surely, 2^{43440215451421} is an apocalyptic number.

It is an amenable number.

43440215451421 is a deficient number, since it is larger than the sum of its proper divisors (2077353267523).

43440215451421 is a wasteful number, since it uses less digits than its factorization.

43440215451421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113401 (or 113378 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 40.

Adding to 43440215451421 its reverse (12415451204434), we get a palindrome (55855666655855).

The spelling of 43440215451421 in words is "forty-three trillion, four hundred forty billion, two hundred fifteen million, four hundred fifty-one thousand, four hundred twenty-one".