21000000010 has 16 divisors (see below), whose sum is σ = 41236363872. Its totient is φ = 7636363600.

The previous prime is 20999999981. The next prime is 21000000019. The reversal of 21000000010 is 1000000012.

It is not an unprimeable number, because it can be changed into a prime (21000000019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95454436 + ... + 95454655.

It is an arithmetic number, because the mean of its divisors is an integer number (2577272742).

Almost surely, 2^21000000010 is an apocalyptic number.

21000000010 is a deficient number, since it is larger than the sum of its proper divisors (20236363862).

21000000010 is a wasteful number, since it uses less digits than its factorization.

21000000010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190909109.

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

Adding to 21000000010 its reverse (1000000012), we get a palindrome (22000000022).

The spelling of 21000000010 in words is "twenty-one billion, ten", and thus it is an aban number and an uban number.