21424433412 has 24 divisors (see below), whose sum is σ = 50180429376. Its totient is φ = 7114322848.

The previous prime is 21424433353. The next prime is 21424433453. The reversal of 21424433412 is 21433442412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21424433412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3391083 + ... + 3397394.

It is an arithmetic number, because the mean of its divisors is an integer number (2090851224).

Almost surely, 2^21424433412 is an apocalyptic number.

It is an amenable number.

21424433412 is an abundant number, since it is smaller than the sum of its proper divisors (28755995964).

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

21424433412 is a wasteful number, since it uses less digits than its factorization.

21424433412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6788747 (or 6788745 counting only the distinct ones).

The product of its digits is 18432, while the sum is 30.

Adding to 21424433412 its reverse (21433442412), we get a palindrome (42857875824).

The spelling of 21424433412 in words is "twenty-one billion, four hundred twenty-four million, four hundred thirty-three thousand, four hundred twelve".