21115332010 has 16 divisors (see below), whose sum is σ = 38173573800. Its totient is φ = 8409249216.

The previous prime is 21115331989. The next prime is 21115332011. The reversal of 21115332010 is 1023351112.

It can be written as a sum of positive squares in 4 ways, for example, as 18468538201 + 2646793809 = 135899^2 + 51447^2 .

It is not an unprimeable number, because it can be changed into a prime (21115332011) 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, 4608045 + ... + 4612624.

Almost surely, 2^21115332010 is an apocalyptic number.

21115332010 is a deficient number, since it is larger than the sum of its proper divisors (17058241790).

21115332010 is a wasteful number, since it uses less digits than its factorization.

21115332010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220905.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 21115332010 its reverse (1023351112), we get a palindrome (22138683122).

The spelling of 21115332010 in words is "twenty-one billion, one hundred fifteen million, three hundred thirty-two thousand, ten".