21224315032 has 32 divisors (see below), whose sum is σ = 41183215920. Its totient is φ = 10246504320.

The previous prime is 21224315017. The next prime is 21224315039. The reversal of 21224315032 is 23051342212.

It is a super-2 number, since 2×21224315032² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21224314988 and 21224315006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224315039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234903 + ... + 312454.

Almost surely, 2^21224315032 is an apocalyptic number.

It is an amenable number.

21224315032 is a deficient number, since it is larger than the sum of its proper divisors (19958900888).

21224315032 is a wasteful number, since it uses less digits than its factorization.

21224315032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547531 (or 547527 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21224315032 its reverse (23051342212), we get a palindrome (44275657244).

The spelling of 21224315032 in words is "twenty-one billion, two hundred twenty-four million, three hundred fifteen thousand, thirty-two".