21231313011 has 24 divisors (see below), whose sum is σ = 30923403264. Its totient is φ = 14036183280.

The previous prime is 21231313003. The next prime is 21231313063. The reversal of 21231313011 is 11031313212.

21231313011 is a `hidden beast` number, since 212 + 313 + 130 + 11 = 666.

It is not a de Polignac number, because 21231313011 - 2³ = 21231313003 is a prime.

It is a super-2 number, since 2×21231313011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21231393011) 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 23 ways as a sum of consecutive naturals, for example, 4303216 + ... + 4308146.

It is an arithmetic number, because the mean of its divisors is an integer number (1288475136).

Almost surely, 2^21231313011 is an apocalyptic number.

21231313011 is a deficient number, since it is larger than the sum of its proper divisors (9692090253).

21231313011 is a wasteful number, since it uses less digits than its factorization.

21231313011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8831 (or 8828 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21231313011 its reverse (11031313212), we get a palindrome (32262626223).

The spelling of 21231313011 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirteen thousand, eleven".