21130212011 has 2 divisors, whose sum is σ = 21130212012. Its totient is φ = 21130212010.

The previous prime is 21130211959. The next prime is 21130212017. The reversal of 21130212011 is 11021203112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21130212011 - 2¹⁰ = 21130210987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130212017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565106005 + 10565106006.

It is an arithmetic number, because the mean of its divisors is an integer number (10565106006).

Almost surely, 2^21130212011 is an apocalyptic number.

21130212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130212011 is an equidigital number, since it uses as much as digits as its factorization.

21130212011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21130212011 its reverse (11021203112), we get a palindrome (32151415123).

The spelling of 21130212011 in words is "twenty-one billion, one hundred thirty million, two hundred twelve thousand, eleven".