21424230436 has 24 divisors (see below), whose sum is σ = 42858426240. Its totient is φ = 9179677632.

The previous prime is 21424230427. The next prime is 21424230461. The reversal of 21424230436 is 63403242412.

It is a junction number, because it is equal to n+sod(n) for n = 21424230398 and 21424230407.

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, 36681 + ... + 210223.

It is an arithmetic number, because the mean of its divisors is an integer number (1785767760).

Almost surely, 2^21424230436 is an apocalyptic number.

It is an amenable number.

21424230436 is an abundant number, since it is smaller than the sum of its proper divisors (21434195804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21424230436 is a wasteful number, since it uses less digits than its factorization.

21424230436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177963 (or 177961 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21424230436 its reverse (63403242412), we get a palindrome (84827472848).

The spelling of 21424230436 in words is "twenty-one billion, four hundred twenty-four million, two hundred thirty thousand, four hundred thirty-six".