21000000000010 has 24 divisors (see below), whose sum is σ = 38451536978436. Its totient is φ = 8257627104960.

The previous prime is 20999999999987. The next prime is 21000000000013. The reversal of 21000000000010 is 1000000000012.

It can be written as a sum of positive squares in 2 ways, for example, as 17273474762769 + 3726525237241 = 4156137^2 + 1930421^2 .

It is not an unprimeable number, because it can be changed into a prime (21000000000013) 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 11 ways as a sum of consecutive naturals, for example, 301602651 + ... + 301672270.

Almost surely, 2^{21000000000010} is an apocalyptic number.

21000000000010 is a deficient number, since it is larger than the sum of its proper divisors (17451536978426).

21000000000010 is an equidigital number, since it uses as much as digits as its factorization.

21000000000010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603275046 (or 603274987 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

Adding to 21000000000010 its reverse (1000000000012), we get a palindrome (22000000000022).

The spelling of 21000000000010 in words is "twenty-one trillion, ten", and thus it is an aban number and an uban number.