21011010010 has 16 divisors (see below), whose sum is σ = 38073645000. Its totient is φ = 8347998016.

The previous prime is 21011009993. The next prime is 21011010011. The reversal of 21011010010 is 1001011012.

It can be written as a sum of positive squares in 4 ways, for example, as 16029332449 + 4981677561 = 126607^2 + 70581^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21011009975 and 21011010002.

It is not an unprimeable number, because it can be changed into a prime (21011010011) 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, 7049185 + ... + 7052164.

Almost surely, 2^21011010010 is an apocalyptic number.

21011010010 is a deficient number, since it is larger than the sum of its proper divisors (17062634990).

21011010010 is a wasteful number, since it uses less digits than its factorization.

21011010010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14101505.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21011010010 its reverse (1001011012), we get a palindrome (22012021022).

The spelling of 21011010010 in words is "twenty-one billion, eleven million, ten thousand, ten".