21224212432 has 20 divisors (see below), whose sum is σ = 41128796160. Its totient is φ = 10610329568.

The previous prime is 21224212423. The next prime is 21224212469. The reversal of 21224212432 is 23421242212.

It is a junction number, because it is equal to n+sod(n) for n = 21224212397 and 21224212406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9682 + ... + 206257.

It is an arithmetic number, because the mean of its divisors is an integer number (2056439808).

Almost surely, 2^21224212432 is an apocalyptic number.

It is an amenable number.

21224212432 is a deficient number, since it is larger than the sum of its proper divisors (19904583728).

21224212432 is a wasteful number, since it uses less digits than its factorization.

21224212432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222090 (or 222084 counting only the distinct ones).

The product of its digits is 3072, while the sum is 25.

Adding to 21224212432 its reverse (23421242212), we get a palindrome (44645454644).

The spelling of 21224212432 in words is "twenty-one billion, two hundred twenty-four million, two hundred twelve thousand, four hundred thirty-two".