21055100567 has 2 divisors, whose sum is σ = 21055100568. Its totient is φ = 21055100566.

The previous prime is 21055100557. The next prime is 21055100617. The reversal of 21055100567 is 76500155012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21055100567 - 2¹⁰ = 21055099543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21055100537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527550283 + 10527550284.

It is an arithmetic number, because the mean of its divisors is an integer number (10527550284).

Almost surely, 2^21055100567 is an apocalyptic number.

21055100567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055100567 is an equidigital number, since it uses as much as digits as its factorization.

21055100567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 32.

Adding to 21055100567 its reverse (76500155012), we get a palindrome (97555255579).

The spelling of 21055100567 in words is "twenty-one billion, fifty-five million, one hundred thousand, five hundred sixty-seven".