21031332011 has 2 divisors, whose sum is σ = 21031332012. Its totient is φ = 21031332010.

The previous prime is 21031332001. The next prime is 21031332017. The reversal of 21031332011 is 11023313012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031332011 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21031332017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515666005 + 10515666006.

It is an arithmetic number, because the mean of its divisors is an integer number (10515666006).

Almost surely, 2^21031332011 is an apocalyptic number.

21031332011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031332011 is an equidigital number, since it uses as much as digits as its factorization.

21031332011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21031332011 its reverse (11023313012), we get a palindrome (32054645023).

The spelling of 21031332011 in words is "twenty-one billion, thirty-one million, three hundred thirty-two thousand, eleven".