21321233011 has 4 divisors (see below), whose sum is σ = 22961327872. Its totient is φ = 19681138152.

The previous prime is 21321232991. The next prime is 21321233033. The reversal of 21321233011 is 11033212312.

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

It is not a de Polignac number, because 21321233011 - 2¹¹ = 21321230963 is a prime.

It is a super-2 number, since 2×21321233011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21321233011.

It is not an unprimeable number, because it can be changed into a prime (21321233051) 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 3 ways as a sum of consecutive naturals, for example, 820047411 + ... + 820047436.

It is an arithmetic number, because the mean of its divisors is an integer number (5740331968).

Almost surely, 2^21321233011 is an apocalyptic number.

21321233011 is a deficient number, since it is larger than the sum of its proper divisors (1640094861).

21321233011 is a wasteful number, since it uses less digits than its factorization.

21321233011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640094860.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21321233011 its reverse (11033212312), we get a palindrome (32354445323).

The spelling of 21321233011 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty-three thousand, eleven".