21241313536 has 27 divisors (see below), whose sum is σ = 42404308401. Its totient is φ = 10619490816.

The previous prime is 21241313453. The next prime is 21241313551. The reversal of 21241313536 is 63531314212.

The square root of 21241313536 is 145744.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2395515136 + 18845798400 = 48944^2 + 137280^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21241313498 and 21241313507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2327350 + ... + 2336458.

Almost surely, 2^21241313536 is an apocalyptic number.

21241313536 is the 145744-th square number.

It is an amenable number.

21241313536 is a deficient number, since it is larger than the sum of its proper divisors (21162994865).

21241313536 is an frugal number, since it uses more digits than its factorization.

21241313536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18234 (or 9111 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

Adding to 21241313536 its reverse (63531314212), we get a palindrome (84772627748).

The spelling of 21241313536 in words is "twenty-one billion, two hundred forty-one million, three hundred thirteen thousand, five hundred thirty-six".