421145124421 has 16 divisors (see below), whose sum is σ = 513287349120. Its totient is φ = 337303088640.

The previous prime is 421145124403. The next prime is 421145124443. The reversal of 421145124421 is 124421541124.

It is not a de Polignac number, because 421145124421 - 2⁹ = 421145123909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421145124451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12713800 + ... + 12746881.

It is an arithmetic number, because the mean of its divisors is an integer number (32080459320).

Almost surely, 2^421145124421 is an apocalyptic number.

It is an amenable number.

421145124421 is a deficient number, since it is larger than the sum of its proper divisors (92142224699).

421145124421 is a wasteful number, since it uses less digits than its factorization.

421145124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25460844.

The product of its digits is 10240, while the sum is 31.

Adding to 421145124421 its reverse (124421541124), we get a palindrome (545566665545).

The spelling of 421145124421 in words is "four hundred twenty-one billion, one hundred forty-five million, one hundred twenty-four thousand, four hundred twenty-one".