21146004613 has 2 divisors, whose sum is σ = 21146004614. Its totient is φ = 21146004612.

The previous prime is 21146004599. The next prime is 21146004619. The reversal of 21146004613 is 31640064112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21111218209 + 34786404 = 145297^2 + 5898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21146004613 is a prime.

It is a super-2 number, since 2×21146004613² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21146004619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10573002306 + 10573002307.

It is an arithmetic number, because the mean of its divisors is an integer number (10573002307).

Almost surely, 2^21146004613 is an apocalyptic number.

It is an amenable number.

21146004613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146004613 is an equidigital number, since it uses as much as digits as its factorization.

21146004613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 21146004613 its reverse (31640064112), we get a palindrome (52786068725).

The spelling of 21146004613 in words is "twenty-one billion, one hundred forty-six million, four thousand, six hundred thirteen".