21424463616 has 36 divisors (see below), whose sum is σ = 57020319272. Its totient is φ = 7141487616.

The previous prime is 21424463611. The next prime is 21424463617. The reversal of 21424463616 is 61636442412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424463611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13947451 + ... + 13948986.

Almost surely, 2^21424463616 is an apocalyptic number.

It is an amenable number.

21424463616 is an abundant number, since it is smaller than the sum of its proper divisors (35595855656).

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

21424463616 is an equidigital number, since it uses as much as digits as its factorization.

21424463616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27896456 (or 27896442 counting only the distinct ones).

The product of its digits is 165888, while the sum is 39.

The spelling of 21424463616 in words is "twenty-one billion, four hundred twenty-four million, four hundred sixty-three thousand, six hundred sixteen".