4521554430421 has 24 divisors (see below), whose sum is σ = 5292620097120. Its totient is φ = 3851431591392.

The previous prime is 4521554430401. The next prime is 4521554430427. The reversal of 4521554430421 is 1240344551254.

It is not a de Polignac number, because 4521554430421 - 2¹¹ = 4521554428373 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 (4521554430427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18348990 + ... + 18593776.

It is an arithmetic number, because the mean of its divisors is an integer number (220525837380).

Almost surely, 2^{4521554430421} is an apocalyptic number.

It is an amenable number.

4521554430421 is a deficient number, since it is larger than the sum of its proper divisors (771065666699).

4521554430421 is a wasteful number, since it uses less digits than its factorization.

4521554430421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247153 (or 247146 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 40.

Adding to 4521554430421 its reverse (1240344551254), we get a palindrome (5761898981675).

The spelling of 4521554430421 in words is "four trillion, five hundred twenty-one billion, five hundred fifty-four million, four hundred thirty thousand, four hundred twenty-one".