21310011011 has 8 divisors (see below), whose sum is σ = 21384691200. Its totient is φ = 21235448520.

The previous prime is 21310010999. The next prime is 21310011029. The reversal of 21310011011 is 11011001312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310011011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21310010983 and 21310011001.

It is not an unprimeable number, because it can be changed into a prime (21310011031) 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, 341450 + ... + 399008.

It is an arithmetic number, because the mean of its divisors is an integer number (2673086400).

Almost surely, 2^21310011011 is an apocalyptic number.

21310011011 is a deficient number, since it is larger than the sum of its proper divisors (74680189).

21310011011 is an equidigital number, since it uses as much as digits as its factorization.

21310011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58849.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21310011011 its reverse (11011001312), we get a palindrome (32321012323).

The spelling of 21310011011 in words is "twenty-one billion, three hundred ten million, eleven thousand, eleven".