21513000011 has 2 divisors, whose sum is σ = 21513000012. Its totient is φ = 21513000010.

The previous prime is 21512999951. The next prime is 21513000017. The reversal of 21513000011 is 11000031512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21513000011 - 2¹⁴ = 21512983627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21513000011.

It is not a weakly prime, because it can be changed into another prime (21513000017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10756500005 + 10756500006.

It is an arithmetic number, because the mean of its divisors is an integer number (10756500006).

Almost surely, 2^21513000011 is an apocalyptic number.

21513000011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21513000011 is an equidigital number, since it uses as much as digits as its factorization.

21513000011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 14.

Adding to 21513000011 its reverse (11000031512), we get a palindrome (32513031523).

The spelling of 21513000011 in words is "twenty-one billion, five hundred thirteen million, eleven", and thus it is an aban number.