21001324311 has 48 divisors (see below), whose sum is σ = 34739228160. Its totient is φ = 12101559360.

The previous prime is 21001324297. The next prime is 21001324319. The reversal of 21001324311 is 11342310012.

21001324311 is a `hidden beast` number, since 2 + 100 + 132 + 431 + 1 = 666.

It is not a de Polignac number, because 21001324311 - 2²¹ = 20999227159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001324319) 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 47 ways as a sum of consecutive naturals, for example, 352645 + ... + 407873.

It is an arithmetic number, because the mean of its divisors is an integer number (723733920).

Almost surely, 2^21001324311 is an apocalyptic number.

21001324311 is a deficient number, since it is larger than the sum of its proper divisors (13737903849).

21001324311 is a wasteful number, since it uses less digits than its factorization.

21001324311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55436 (or 55433 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21001324311 its reverse (11342310012), we get a palindrome (32343634323).

The spelling of 21001324311 in words is "twenty-one billion, one million, three hundred twenty-four thousand, three hundred eleven".