21224440024 has 16 divisors (see below), whose sum is σ = 42136756200. Its totient is φ = 9987971712.

The previous prime is 21224440009. The next prime is 21224440033. The reversal of 21224440024 is 42004442212.

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, 78030894 + ... + 78031165.

Almost surely, 2^21224440024 is an apocalyptic number.

It is an amenable number.

21224440024 is a deficient number, since it is larger than the sum of its proper divisors (20912316176).

21224440024 is a wasteful number, since it uses less digits than its factorization.

21224440024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156062082 (or 156062078 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21224440024 its reverse (42004442212), we get a palindrome (63228882236).

The spelling of 21224440024 in words is "twenty-one billion, two hundred twenty-four million, four hundred forty thousand, twenty-four".