21424111445421 has 12 divisors (see below), whose sum is σ = 30950148609120. Its totient is φ = 14280797953800.

The previous prime is 21424111445323. The next prime is 21424111445431. The reversal of 21424111445421 is 12454411142412.

21424111445421 is a `hidden beast` number, since 2 + 1 + 42 + 41 + 114 + 45 + 421 = 666.

It is not a de Polignac number, because 21424111445421 - 2¹¹ = 21424111443373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424111445431) 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 11 ways as a sum of consecutive naturals, for example, 161847651 + ... + 161979968.

It is an arithmetic number, because the mean of its divisors is an integer number (2579179050760).

Almost surely, 2^{21424111445421} is an apocalyptic number.

It is an amenable number.

21424111445421 is a deficient number, since it is larger than the sum of its proper divisors (9526037163699).

21424111445421 is a wasteful number, since it uses less digits than its factorization.

21424111445421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323834976 (or 323834973 counting only the distinct ones).

The product of its digits is 40960, while the sum is 36.

Adding to 21424111445421 its reverse (12454411142412), we get a palindrome (33878522587833).

The spelling of 21424111445421 in words is "twenty-one trillion, four hundred twenty-four billion, one hundred eleven million, four hundred forty-five thousand, four hundred twenty-one".