21331321011 has 96 divisors (see below), whose sum is σ = 41953766400. Its totient is φ = 10084435200.

The previous prime is 21331320973. The next prime is 21331321031. The reversal of 21331321011 is 11012313312.

21331321011 is a `hidden beast` number, since 2 + 1 + 331 + 321 + 0 + 11 = 666.

It is not a de Polignac number, because 21331321011 - 2⁷ = 21331320883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331321031) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 622965 + ... + 656313.

It is an arithmetic number, because the mean of its divisors is an integer number (437018400).

Almost surely, 2^21331321011 is an apocalyptic number.

21331321011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21331321011 is a deficient number, since it is larger than the sum of its proper divisors (20622445389).

21331321011 is a wasteful number, since it uses less digits than its factorization.

21331321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33457 (or 33454 counting only the distinct ones).

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

Adding to 21331321011 its reverse (11012313312), we get a palindrome (32343634323).

The spelling of 21331321011 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-one thousand, eleven".