21626272513 has 2 divisors, whose sum is σ = 21626272514. Its totient is φ = 21626272512.

The previous prime is 21626272489. The next prime is 21626272517. The reversal of 21626272513 is 31527262612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713123904 + 5913148609 = 125352^2 + 76897^2 .

It is a cyclic number.

It is not a de Polignac number, because 21626272513 - 2¹³ = 21626264321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21626272517) 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, 10813136256 + 10813136257.

It is an arithmetic number, because the mean of its divisors is an integer number (10813136257).

Almost surely, 2^21626272513 is an apocalyptic number.

It is an amenable number.

21626272513 is a deficient number, since it is larger than the sum of its proper divisors (1).

21626272513 is an equidigital number, since it uses as much as digits as its factorization.

21626272513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 37.

Subtracting 21626272513 from its reverse (31527262612), we obtain a palindrome (9900990099).

The spelling of 21626272513 in words is "twenty-one billion, six hundred twenty-six million, two hundred seventy-two thousand, five hundred thirteen".