21038632210 has 16 divisors (see below), whose sum is σ = 38490351192. Its totient is φ = 8277494400.

The previous prime is 21038632187. The next prime is 21038632213. The reversal of 21038632210 is 1223683012.

It is a Cunningham number, because it is equal to 145047²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 11348001729 + 9690630481 = 106527^2 + 98441^2 .

It is not an unprimeable number, because it can be changed into a prime (21038632213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17244171 + ... + 17245390.

Almost surely, 2^21038632210 is an apocalyptic number.

21038632210 is a deficient number, since it is larger than the sum of its proper divisors (17451718982).

21038632210 is a wasteful number, since it uses less digits than its factorization.

21038632210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34489629.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21038632210 in words is "twenty-one billion, thirty-eight million, six hundred thirty-two thousand, two hundred ten".