21054043207 has 2 divisors, whose sum is σ = 21054043208. Its totient is φ = 21054043206.

The previous prime is 21054043201. The next prime is 21054043211. The reversal of 21054043207 is 70234045012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21054043207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21054043201) 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, 10527021603 + 10527021604.

It is an arithmetic number, because the mean of its divisors is an integer number (10527021604).

Almost surely, 2^21054043207 is an apocalyptic number.

21054043207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054043207 is an equidigital number, since it uses as much as digits as its factorization.

21054043207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

Adding to 21054043207 its reverse (70234045012), we get a palindrome (91288088219).

The spelling of 21054043207 in words is "twenty-one billion, fifty-four million, forty-three thousand, two hundred seven".