21010241505 has 96 divisors (see below), whose sum is σ = 38511728640. Its totient is φ = 9695681280.

The previous prime is 21010241501. The next prime is 21010241507. The reversal of 21010241505 is 50514201012.

It is not a de Polignac number, because 21010241505 - 2² = 21010241501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010241501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10615606 + ... + 10617584.

It is an arithmetic number, because the mean of its divisors is an integer number (401163840).

Almost surely, 2^21010241505 is an apocalyptic number.

It is an amenable number.

21010241505 is a deficient number, since it is larger than the sum of its proper divisors (17501487135).

21010241505 is a wasteful number, since it uses less digits than its factorization.

21010241505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119 (or 2082 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 21010241505 its reverse (50514201012), we get a palindrome (71524442517).

The spelling of 21010241505 in words is "twenty-one billion, ten million, two hundred forty-one thousand, five hundred five".