21312010011 has 4 divisors (see below), whose sum is σ = 28416013352. Its totient is φ = 14208006672.

The previous prime is 21312009997. The next prime is 21312010021. The reversal of 21312010011 is 11001021312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21312010011 - 2¹⁰ = 21312008987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312010021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3552001666 + ... + 3552001671.

It is an arithmetic number, because the mean of its divisors is an integer number (7104003338).

Almost surely, 2^21312010011 is an apocalyptic number.

21312010011 is a deficient number, since it is larger than the sum of its proper divisors (7104003341).

21312010011 is an equidigital number, since it uses as much as digits as its factorization.

21312010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104003340.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21312010011 its reverse (11001021312), we get a palindrome (32313031323).

The spelling of 21312010011 in words is "twenty-one billion, three hundred twelve million, ten thousand, eleven".