21331031011 has 2 divisors, whose sum is σ = 21331031012. Its totient is φ = 21331031010.

The previous prime is 21331030957. The next prime is 21331031021. The reversal of 21331031011 is 11013013312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21331031011 - 2⁹ = 21331030499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331031021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665515505 + 10665515506.

It is an arithmetic number, because the mean of its divisors is an integer number (10665515506).

Almost surely, 2^21331031011 is an apocalyptic number.

21331031011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331031011 is an equidigital number, since it uses as much as digits as its factorization.

21331031011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21331031011 its reverse (11013013312), we get a palindrome (32344044323).

The spelling of 21331031011 in words is "twenty-one billion, three hundred thirty-one million, thirty-one thousand, eleven".