24400040000221 has 8 divisors (see below), whose sum is σ = 24407691255864. Its totient is φ = 24392389539840.

The previous prime is 24400040000207. The next prime is 24400040000249. The reversal of 24400040000221 is 12200004000442.

It can be written as a sum of positive squares in 4 ways, for example, as 16689797721 + 24383350202500 = 129189^2 + 4937950^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 24400040000221 - 2¹⁵ = 24400039967453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24400040000521) 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, 64440765 + ... + 64818301.

It is an arithmetic number, because the mean of its divisors is an integer number (3050961406983).

Almost surely, 2^{24400040000221} is an apocalyptic number.

It is an amenable number.

24400040000221 is a deficient number, since it is larger than the sum of its proper divisors (7651255643).

24400040000221 is a wasteful number, since it uses less digits than its factorization.

24400040000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397631.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 24400040000221 its reverse (12200004000442), we get a palindrome (36600044000663).

The spelling of 24400040000221 in words is "twenty-four trillion, four hundred billion, forty million, two hundred twenty-one", and thus it is an aban number.