21054103111 has 2 divisors, whose sum is σ = 21054103112. Its totient is φ = 21054103110.

The previous prime is 21054103097. The next prime is 21054103117. The reversal of 21054103111 is 11130145012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21054103111 - 2⁵ = 21054103079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21054103117) 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, 10527051555 + 10527051556.

It is an arithmetic number, because the mean of its divisors is an integer number (10527051556).

Almost surely, 2^21054103111 is an apocalyptic number.

21054103111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054103111 is an equidigital number, since it uses as much as digits as its factorization.

21054103111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21054103111 its reverse (11130145012), we get a palindrome (32184248123).

The spelling of 21054103111 in words is "twenty-one billion, fifty-four million, one hundred three thousand, one hundred eleven".