21146004653 has 2 divisors, whose sum is σ = 21146004654. Its totient is φ = 21146004652.

The previous prime is 21146004637. The next prime is 21146004679. The reversal of 21146004653 is 35640064112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17901904804 + 3244099849 = 133798^2 + 56957^2 .

It is a cyclic number.

It is not a de Polignac number, because 21146004653 - 2⁴ = 21146004637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21146004613) 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, 10573002326 + 10573002327.

It is an arithmetic number, because the mean of its divisors is an integer number (10573002327).

Almost surely, 2^21146004653 is an apocalyptic number.

It is an amenable number.

21146004653 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146004653 is an equidigital number, since it uses as much as digits as its factorization.

21146004653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 21146004653 its reverse (35640064112), we get a palindrome (56786068765).

The spelling of 21146004653 in words is "twenty-one billion, one hundred forty-six million, four thousand, six hundred fifty-three".