21655024010 has 8 divisors (see below), whose sum is σ = 38979043236. Its totient is φ = 8662009600.

The previous prime is 21655023983. The next prime is 21655024019. The reversal of 21655024010 is 1042055612.

It can be written as a sum of positive squares in 2 ways, for example, as 18435936841 + 3219087169 = 135779^2 + 56737^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21655024019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082751191 + ... + 1082751210.

Almost surely, 2^21655024010 is an apocalyptic number.

21655024010 is a deficient number, since it is larger than the sum of its proper divisors (17324019226).

21655024010 is a wasteful number, since it uses less digits than its factorization.

21655024010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165502408.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21655024010 its reverse (1042055612), we get a palindrome (22697079622).

The spelling of 21655024010 in words is "twenty-one billion, six hundred fifty-five million, twenty-four thousand, ten".