21313031011 has 8 divisors (see below), whose sum is σ = 21688797344. Its totient is φ = 20938115520.

The previous prime is 21313030939. The next prime is 21313031023. The reversal of 21313031011 is 11013031312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21313031011 - 2¹¹ = 21313028963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313031711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162066 + ... + 262471.

It is an arithmetic number, because the mean of its divisors is an integer number (2711099668).

Almost surely, 2^21313031011 is an apocalyptic number.

21313031011 is a deficient number, since it is larger than the sum of its proper divisors (375766333).

21313031011 is an equidigital number, since it uses as much as digits as its factorization.

21313031011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425421.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21313031011 its reverse (11013031312), we get a palindrome (32326062323).

The spelling of 21313031011 in words is "twenty-one billion, three hundred thirteen million, thirty-one thousand, eleven".