21440331011 has 32 divisors (see below), whose sum is σ = 25145856000. Its totient is φ = 18088560000.

The previous prime is 21440331001. The next prime is 21440331013. The reversal of 21440331011 is 11013304412.

It is a cyclic number.

It is not a de Polignac number, because 21440331011 - 2²⁶ = 21373222147 is a prime.

It is a super-2 number, since 2×21440331011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440331013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1466186 + ... + 1480736.

It is an arithmetic number, because the mean of its divisors is an integer number (785808000).

Almost surely, 2^21440331011 is an apocalyptic number.

21440331011 is a deficient number, since it is larger than the sum of its proper divisors (3705524989).

21440331011 is a wasteful number, since it uses less digits than its factorization.

21440331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14771.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21440331011 its reverse (11013304412), we get a palindrome (32453635423).

The spelling of 21440331011 in words is "twenty-one billion, four hundred forty million, three hundred thirty-one thousand, eleven".