21420543224 has 32 divisors (see below), whose sum is σ = 41119056000. Its totient is φ = 10455722592.

The previous prime is 21420543211. The next prime is 21420543259. The reversal of 21420543224 is 42234502412.

It is a super-2 number, since 2×21420543224² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 686147 + ... + 716685.

It is an arithmetic number, because the mean of its divisors is an integer number (1284970500).

Almost surely, 2^21420543224 is an apocalyptic number.

It is an amenable number.

21420543224 is a deficient number, since it is larger than the sum of its proper divisors (19698512776).

21420543224 is a wasteful number, since it uses less digits than its factorization.

21420543224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32627 (or 32623 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The spelling of 21420543224 in words is "twenty-one billion, four hundred twenty million, five hundred forty-three thousand, two hundred twenty-four".