21243937010 has 16 divisors (see below), whose sum is σ = 38617693272. Its totient is φ = 8413440000.

The previous prime is 21243937003. The next prime is 21243937019. The reversal of 21243937010 is 1073934212.

It is a Cunningham number, because it is equal to 145753²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 20410979689 + 832957321 = 142867^2 + 28861^2 .

It is not an unprimeable number, because it can be changed into a prime (21243937019) 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 7 ways as a sum of consecutive naturals, for example, 10515791 + ... + 10517810.

Almost surely, 2^21243937010 is an apocalyptic number.

21243937010 is a deficient number, since it is larger than the sum of its proper divisors (17373756262).

21243937010 is a wasteful number, since it uses less digits than its factorization.

21243937010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21033709.

The product of its (nonzero) digits is 9072, while the sum is 32.

The spelling of 21243937010 in words is "twenty-one billion, two hundred forty-three million, nine hundred thirty-seven thousand, ten".