21040242010 has 16 divisors (see below), whose sum is σ = 37875523176. Its totient is φ = 8415410688.

The previous prime is 21040242007. The next prime is 21040242053. The reversal of 21040242010 is 1024204012.

It can be written as a sum of positive squares in 4 ways, for example, as 13000788441 + 8039453569 = 114021^2 + 89663^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 53854 + ... + 212086.

Almost surely, 2^21040242010 is an apocalyptic number.

21040242010 is a deficient number, since it is larger than the sum of its proper divisors (16835281166).

21040242010 is a wasteful number, since it uses less digits than its factorization.

21040242010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171537.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21040242010 its reverse (1024204012), we get a palindrome (22064446022).

The spelling of 21040242010 in words is "twenty-one billion, forty million, two hundred forty-two thousand, ten".