21103121311 has 2 divisors, whose sum is σ = 21103121312. Its totient is φ = 21103121310.

The previous prime is 21103121293. The next prime is 21103121317. The reversal of 21103121311 is 11312130112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21103121311 - 2⁷ = 21103121183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103121317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551560655 + 10551560656.

It is an arithmetic number, because the mean of its divisors is an integer number (10551560656).

Almost surely, 2^21103121311 is an apocalyptic number.

21103121311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103121311 is an equidigital number, since it uses as much as digits as its factorization.

21103121311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21103121311 its reverse (11312130112), we get a palindrome (32415251423).

The spelling of 21103121311 in words is "twenty-one billion, one hundred three million, one hundred twenty-one thousand, three hundred eleven".