21013015010 has 16 divisors (see below), whose sum is σ = 40732921656. Its totient is φ = 7758651648.

The previous prime is 21013015007. The next prime is 21013015043. The reversal of 21013015010 is 1051031012.

It can be written as a sum of positive squares in 4 ways, for example, as 9370820809 + 11642194201 = 96803^2 + 107899^2 .

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, 80819159 + ... + 80819418.

Almost surely, 2^21013015010 is an apocalyptic number.

21013015010 is a deficient number, since it is larger than the sum of its proper divisors (19719906646).

21013015010 is a wasteful number, since it uses less digits than its factorization.

21013015010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161638597.

The product of its (nonzero) digits is 30, while the sum is 14.

Adding to 21013015010 its reverse (1051031012), we get a palindrome (22064046022).

The spelling of 21013015010 in words is "twenty-one billion, thirteen million, fifteen thousand, ten".