21258626611 has 2 divisors, whose sum is σ = 21258626612. Its totient is φ = 21258626610.

The previous prime is 21258626579. The next prime is 21258626621. The reversal of 21258626611 is 11662685212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21258626611 - 2⁵ = 21258626579 is a prime.

It is not a weakly prime, because it can be changed into another prime (21258626621) 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, 10629313305 + 10629313306.

It is an arithmetic number, because the mean of its divisors is an integer number (10629313306).

Almost surely, 2^21258626611 is an apocalyptic number.

21258626611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21258626611 is an equidigital number, since it uses as much as digits as its factorization.

21258626611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The spelling of 21258626611 in words is "twenty-one billion, two hundred fifty-eight million, six hundred twenty-six thousand, six hundred eleven".